九州大学-研究者情報 [光田暁弘 (准教授) 理学研究院物理学部門]

光田暁弘（みつだあきひろ）

データ更新日：2024.04.18

准教授　／　理学研究院物理学部門物性物理学講座

原著論文

1.	Masanobu Shiga, Isao Maruyama, Akihiro Mitsuda, Hirofumi Wada, Tatsuya Kawae, Electronic density of state in valence fluctuating Kondo lattice systems studied by point-contact spectroscopy, Low Temp. Phys., 0.1063/10.0019701, 49, 7, 960-971, 2023.05.
2.	Masanobu Shiga, Takuya Takahashi, Tsubasa Teramoto, Isao Maruyama, Akihiro Mitsuda, Hirofumi Wada, Tatsuya Kawae, Observation of Hybridization Gap in Heavy Fermion System EuNi₂(P_1−xGe_x)₂ via Point-Contact Spectroscopy, JPS Conf. Proc., 10.7566/jpscp.38.011098, 38, 011098-1-011098-6, 2023.05.
3.	光田暁弘, 大山耕平, 和田裕文, 平尾直久, 河口沙織, 大石泰生, 郷地順, 上床美也, 高圧力下におけるYbPdの価数秩序の崩壊と量子価数揺らぎの誘起, 高圧力の科学と技術, 32, 20-26, 2022.03.
4.	Riku Iimori, Sora Obinata, Akihiro Mitsuda, Takashi Kimura, Pressure-induced enhancement of spin-charge conversion efficiency in CoFeB/Pt bilayer, Applied Physics Express, 10.35848/1882-0786/ac5501, 15, 033003-1-033003-5, 2022.02.
5.	Jose R. L. Mardegan, Serhane Zerdane, Giulia Mancini, Vincent Esposito, Jérémy R. Rouxel, Roman Mankowsky, Cristian Svetina, Namrata Gurung, Sergii Parchenko, Michael Porer, Bulat Burganov, Yunpei Deng, Paul Beaud, Gerhard Ingold, Bill Pedrini, Christopher Arrell, Christian Erny, Andreas Dax, Henrik Lemke, Martin Decker, Nazaret Ortiz, Chris Milne, Grigory Smolentsev, Laura Maurel, Steven L. Johnson, Akihiro Mitsuda, Hirofumi Wada, Yuichi Yokoyama, Hiroki Wadati, and Urs Staub, Ultrafast electron localization in the EuNi₂(Si_0.21Ge_0.79)₂ correlated metal, Phys. Rev. Res., 10.1103/PhysRevResearch.3.033211, 3, 033211-1-033211-12, 2021.09.
6.	Masanobu Shiga, Isao Maruyama, Kengo Okimura, Takurou Harada, Takuya Takahashi, Akihiro Mitsuda, Hirofumi Wada, Yuji Inagaki, and Tatsuya Kawae, Evolution of lattice coherence in the intermediate-valence heavy-fermion compound EuNi₂P₂ studied by point contact spectroscopy, PHYSICAL REVIEW B, 10.1103/PhysRevB.103.L041113, 103, 4, L041113-1-L041113-6, 2021.01, We performed a point contact spectroscopy study in an intermediate-valence heavy-fermion (HF) compound EuNi<sub>2</sub>P<sub>2</sub>. Above the Kondo temperature T<sub>K</sub> , the differential conductance spectra show a broad peak due to the Kondo resonance at the Eu site. Below T<sub>K</sub> , the broad peak splits into two peaks that can be reproduced by the summation of two Fano curves with the same parameters, indicating the emergence of the indirect hybridization gap in an Anderson lattice. With decreasing temperature, the separation between the two peaks increases and saturates at very low temperatures. The results reveal the evolution of the electronic structure in the HF state due to the development of the lattice coherence..
7.	Satoshi Tsutsui, Takumi Hasegawa, Akihiro Mitsuda, Masaki Sugishima, Kohei Oyama, Masaichiro Mizumaki, Norio Ogita, Hirofumi Wada, and Masayuki Udagawa, Lattice instability coupled with valence degrees of freedom in valence fluctuation compound YbPd, PHYSICAL REVIEW B, 10.1103/PhysRevB.102.245150, 102, 24, 245150-1-245150-9, 2020.12.
8.	Kohei Oyama, Akihiro Mitsuda, Hirofumi Wada, Yasuo Narumi, Masayuki Hagiwara, Ryunosuke Takahashi, Hiroki Wadati, Hiroyuki Setoyama, and Koichi Kindo, Ga Substitution Effect on the Valence Transition of Eu₂Pt₆Al₁₅, J. Phys. Soc. Jpn., 10.7566/JPSJ.89.114713, 89, 114713-1-114713-7, 2020.11.
9.	Akihiro Mitsuda, Hirofumi Wada, Ryo Masuda, Shinji Kitao, Makoto Seto, Yoshitaka Yoda, and Hisao Kobayashi, Valence Transition of EuRh₂Si₂ Studied by Synchrotron Mössbauer Spectroscopy, J. Phys. Soc. Jpn., 10.7566/JPSJ.89.104703, 89, 104703-1-104703-5, 2020.10.
10.	Ryohei Shimokasa, Naomi Kawamura, Takayuki Matsumoto, Koki Kawakami, Taku Kawabata, Gen Isumi, Takayuki Uozumi, Akihiro Mitsuda, Hirofumi Wada, Masaichiro Mizumaki, Kojiro Mimura, Temperature-induced valence transition in EuNi₂(Si_1–xGe_x)₂ investigated by high-energy resolution fluorescence detection X-ray absorption spectroscopy, Radiation Physics and Chemistry, 10.1016/j.radphyschem.2019.02.009, 175, 108150-1-108150-4, 2020.10, [URL], Electronic structures of the temperature-induced valence transition system EuNi₂(Si_1–xGe_x)₂ with x = 0.70, 0.79, 0.82 have been investigated by means of high-energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS). The HERFD-XAS spectra clearly change their intensities of Eu²⁺ and Eu³⁺ components which directly reflect the temperature-induced valence transition. For x = 0.70, gradual spectral change exhibits a continuous valence transition, while drastic changes for x = 0.79 and 0.82 indicate first-order valence transitions. High-energy resolution measurements made it possible to observe additional fine structures which are recognized more clearly below the transition temperature. Existence of these fine structures suggests that many-body effect plays an important role in the temperature-induced valence transition of this system. The variation of Eu mean valence estimated from the HERFD-XAS spectra for each x correlates with that of magnetic susceptibility..
11.	Akihiro Mitsuda, Motoki Kaneda, Kanta Matsutomo, Takashi Kimura, Hiromi Yuasa, Pressure Effects on Magnetic and Transport Properties in CoFe-Based Spin Valve, Materials Transactions, 10.2320/matertrans.MT-MN2019040, 61, 8, 1483-1486, 2020.08, [URL], We have studied the magnetoresistance of an enhanced-biased spin valve device under high pressure. The magnetoresistance decreases by 0.0014 up to 2 GPa with increasing pressure, which is inferred to be due to slight deviation from an antiparallel-spin configuration of the free and pinned layers. In the pressure range between 2 and 2.75 GPa, the exchange bias field generated in the pinned layer decreases and the coercivity of the free layers clearly increases by ∼5 Oe, which is likely to be related to less hydrostatic pressure..
12.	Ryohei SHIMOKASA, Naomi KAWAMURA, Taku KAWABATA, Gen ISUMI, Takayuki UOZUMI, Akihiro MITSUDA, Hirofumi WADA, Fuminori HONDA, Masato HEDO, Takao NAKAMA, Yoshichika ŌNUKI, Masaichiro MIZUMAKI, Kojiro MIMURA, Electronic Structure of the Valence Transition System Eu(Rh_1–xT_x)₂Si₂ (T = Co, Ir) Studied by High-Energy Resolution Fluorescence Detection X-Ray Absorption Spectroscopy, JPS Conf. Proc., 10.7566/JPSCP.30.011134, 30, 011134-1-011134-5, 2020.03.
13.	Yoshiki NAKANISHI, Shinya KUDO, Kyouhei KIKUTANI, Mitsuteru NAKAMURA, Masahito YOSHIZAWA, Akihiro MITSUDA , Ultrasound investigation of the Eu-based mixed valence system EuRh₂Si₂, JPS Conf. Proc., 10.7566/JPSCP.30.011139, 30, 011133-1-011133-5, 2020.03.
14.	Masanobu Shiga, Takurou Harada, Takuya Takahashi, Akihiro Mitsuda, Hirofumi Wada, Yuji Inagaki, Tatsuya Kawae, Point-Contact Spectroscopy Study of YbPd/W Interface, JPS Conf. Proc., 10.7566/JPSCP.30.011139, 30, 011139-1-011139-6, 2020.03.
15.	Kohei Oyama, Kousuke Tanabe, Akihiro Mitsuda, Hirofumi Wada, Naohisa Hirao, Saori Imada Kawaguchi, Yasuo Ohishi, Jun Gouchi, Yoshiya Uwatoko, Pressure-induced Cubic Valence Fluctuating Ground State in YbPd, JPS Conf. Proc., 10.7566/JPSCP.30.011141, 30, 011141-1-011141-6, 2020.03.
16.	Y. Nakai, R. Nakanishi, T. Fujii, M. Hirata, K. Oyama, A. Mitsuda, K. Ueda, H. Wada, T.Mito, Development of Low-Energy Fluctuations Toward Structural Transition in YbPd Inferred from ¹⁰⁵Pd NMR, JPS Conf. Proc., 10.7566/JPSCP.30.011140, 30, 011140-1-011140-4, 2020.03.
17.	Shiga Masanobu, Okimura Kengo, Takata Hiroki, Mitsuda Akihiro, Maruyama Isao, Wada Hirofumi, Inagaki Yuji, Kawae Tatsuya, Observation of Kondo resonance in valence-ordered YbPd, Phys. Rev. B, 10.1103/PhysRevB.100.245117, 100, 24, 245117-1-245117-7, 2019.12, We performed a point-contact spectroscopy study of intermediate valence compound YbPd, in which two Yb sites are ordered with the valence values of 3+ and 2.6+. Differential conductance spectra exhibit a dip structure at around zero bias with an asymmetric background, which can be reproduced by the summation of two Kondo resonances. Fitting with the Fano equation, the Kondo temperature of the 3+ site is estimated to be ∼30K, while that of the 2.6+ site is ∼800K. Additionally, the dip amplitude exhibits −lnT dependence below ∼25K and saturates at ∼1K. These results provide direct evidence for the screening of magnetic moments at the valence ordering sites owing to the Kondo effect..
18.	Y. Yokoyama, K. Kawakami, Y. Hirata, K. Takubo, K. Yamamoto, K. Abe, A. Mitsuda, H. Wada, T. Uozumi, S. Yamamoto, I. Matsuda, S. Kimura, K. Mimura, H. Wadati, Photoinduced valence dynamics in EuNi₂(Si_0.21Ge_0.79)₂ studied via time-resolved x-ray absorption spectroscopy, Physical Review B, 10.1103/PhysRevB.100.115123, 100, 11, 115123-1-115123-6, 2019.09, [URL], The photoinduced valence dynamics of EuNi2(Si0.21Ge0.79)2 were investigated using time-resolved x-ray absorption spectroscopy for Eu M5 edge. Through the pump-probe technique with synchrotron x-ray and Ti:sapphire laser pulses, a photoinduced valence transition was observed from Eu3+ to Eu2+. Because the lifetime of a photoinduced state can be up to 3 ns, a metastable state is considered to be realized. By comparing the experimental results with the theoretical calculations, the photoinduced valence transition between Eu 4f and conduction electrons was quantitatively evaluated..
19.	Hirofumi Wada, Kosuke Tanabe, Ibuki Yamamoto, Akihiro Mitsuda, Magnetic transport properties of heavy fermionic EuNi₂P₂, Solid State Communications, 10.1016/j.ssc.2019.113665, 300, 113665-1-113665-5, 2019.10, [URL], Electrical resistivity, magnetoresistance (MR) and Hall resistivity have been measured for Eu-based heavy fermion compound EuNi₂P₂ (exact composition is Eu_1.2Ni₂P_2.1). It is found that the 4f electron contribution to the resistivity shows −log T above 200 K. The MR is positive at the lowest temperature and shows a negative minimum at around 60 K. The Hall resistivity shows a broad positive peak at around 120 K. These results are very similar to those of typical heavy fermions, CeCu₆ and CeAl₃. We discuss the results in terms of the Kondo model for heavy fermions. Measurements under high pressures suggest that the scaling of the Hall effect is valid below 1.5 GPa in EuNi₂P₂..
20.	Taisuke Aoyama, Tetsuro Kubo, Haruki Matsuno, Hisashi Kotegawa, Hideki Tou, Akihiro Mitsuda, Yutaro Nagano, Nobutaka Araoka, Hirofumi Wada, Yuh Yamada, ¹⁹⁵Pt-NMR evidence for opening of partial charge-density-wave gap in layered LaPt₂Si₂ with CaBe₂Ge₂ structure, Journal of the Physical Society of Japan, 10.7566/JPSJ.87.124713, 87, 12, 124713-1-124713-5, 2018.12, [URL], We carried out ¹⁹⁵Pt-NMR measurements for a single-crystal LaPt₂Si₂, which is expected to show the coexistence of a superconducting state and a charge density wave (CDW) state. LaPt₂Si₂ crystallizes to a quasi-two-dimensional CaBe₂Ge₂-type crystal structure consisting of two types of Pt₂Si₂ layers: Pt1 and Pt2. From both the Knight shift, ¹⁹⁵K, and the NMR relaxation rate divided by the temperature, 1=T₁T, the electronic density of states at the Fermi level, N(ε_F), for only the Pt1 site decreases below the CDW transition temperature T⁺ = 112 K, whereas N(ε_F) for the Pt2 site does not change. These results suggest that the CDW occurs only in the Pt1 layers below 112 K. Furthermore, above T⁺, we also found that both¹⁹⁵K and 1=T₁T decrease upon cooling only for the Pt1 site. The temperature dependences of K and 1=T₁T for the Pt1 site can be explained by assuming a two bands model consisting of a wide band and a narrow band near the Fermi level. The CDW transition is expected to occur only in the narrow band of the Pt1 site, while the wide band of the Pt1-site does not contribute to the CDW transition. The present result strongly indicates that the CDW gap opens partially at the Fermi surface..
21.	Kohei Oyama, Masaki Sugishima, Kousuke Tanabe, Akihiro Mitsuda, Hirofumi Wada, Kenji Ohoyama, Takeshi Matsukawa, Yukihiko Yoshida, Akinori Hoshikawa, Toru Ishigaki, Kazuaki Iwasa, Neutron diffraction studies on valence ordering compound YbPd, journal of the physical society of japan, 10.7566/JPSJ.87.114705, 87, 11, 114705-1-114705-6, 2018.10, [URL], The magnetic structure of YbPd was determined for a newly synthesized strain-free sample by neutron diffraction techniques. The sinusoidal magnetic structure characterized by an incommensurate wave vector k = (0.080 0 0.32) is observed in the magnetic-ordered phase between T₃ = 1.9 K and T₄ = 0.5 K, which is composed of the magneticmoment amplitude of 0.3 μB parallel to the a-axis in the tetragonal crystal-structure phase. The modulated magnetic structure is consistent with the previously proposed Yb-ion valence ordered structure appearing below T₂ = 105 K, which consists of the periodic arrangement of magnetic and nonmagnetic Yb ions..
22.	Motomichi Koyama, Kenji Hirata, Yuji Abe, Akihiro Mitsuda, Satoshi Iikubo, Kaneaki Tsuzaki, An unconventional hydrogen effect that suppresses thermal formation of the hcp phase in fcc steels, Scientific reports, 10.1038/s41598-018-34542-0, 8, 1, 16136-1-16136-7, 2018.10, [URL], Iron and steels are extensively used as structural materials, and have three primary phase structures: Body-centered cubic (bcc), face-centered cubic (fcc), and hexagonal closed-packed (hcp). Controlling phase stabilities, especially by the use of interstitials, is a universal method that provides a diverse variety of functional and mechanical properties in steels. In this context, hydrogen, which can act as an interstitial species in steels, has been recognized to promote phase transformation from fcc to hcp. However, we here report a dramatic effect of interstitial hydrogen that suppresses this hcp phase transformation. More specifically, the fraction of hcp phase that forms during cooling decreases with increasing diffusible hydrogen content. This new finding opens new venues for thermodynamics-based microstructure design and for development of robust, strong, and ductile steels in hydrogen-related infrastructures..
23.	Akihiro Mitsuda, Eigo Kishaba, Takumi Fujimoto, Kohei Oyama, Hirofumi Wada, Masaichiro Mizumaki, Naomi Kawamura, Naoki Ishimatsu, Pressure and magnetic field effects on the valence transition of EuRh₂Si₂, Physica B: Condensed Matter, 10.1016/j.physb.2017.10.045, 536, 427-431, 2018.05, [URL], We have measured the X-ray absorption spectra (XAS), electrical resistivity and magnetic susceptibility of EuRh₂Si₂, which undergoes a valence transition under high pressures. A sharp decrease in the Eu valence determined from the XAS was observed at around 70K in the temperature dependence at P = 1.2-1.9GPa. In the temperature dependence of electrical resistivity and magnetic susceptibility, we observed jumps associated with the temperature-induced valence transition under high pressures. The magnetoresistance detected a field-induced valence transition. The results are discussed from the thermodynamic point of view..
24.	Akihiro Mitsuda, Shigeki Manabe, Masafumi Umeda, Hirofumi Wada, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masaichiro Mizumaki, Naomi Kawamura, Kiyofumi Nitta, Naohisa Hirao, Yasuo Ohishi, Naoki Ishimatsu, Emergence of a new valence-ordered structure and collapse of the magnetic order under high pressure in EuPtP, Journal of Physics Condensed Matter, 10.1088/1361-648X/aaaca3, 30, 10, 150603-1-150603-8, 2018.02, [URL].
25.	Hirofumi Wada, Yusuke Goki, Akihiro Mitsuda, Transport properties of EuNi₂Ge₂ under high pressure, Journal of the Physical Society of Japan, 10.7566/JPSJ.87.034707, 87, 3, 034707-1-034707-7, 2018.01, [URL], Transverse magnetoresistance (MR) and Hall effect have been measured for EuNi₂Ge₂ single crystals under high pressures up to 2.0 GPa. The compound undergoes a valence transition from a nearly trivalent state to a divalent state with increasing temperature above 1.6 GPa. It was found that the transverse MR of EuNi₂Ge₂ is negative at low temperatures in the nearly trivalent state, although the compound is nonmagnetic. The origin of the negative MR is discussed. In the temperature dependence of the Hall resistivity ρH, large jumps associated with the valence transition were observed at the valence transition temperature. We also examined the field-induced valence transition by the MR and ρ_H measurements. A marked change in the Hall coefficient was observed at the valence transition field. Our analyses suggest that the ordinary Hall effect plays a dominant role in the changes in ρ_H at the valence transition..
26.	Katsuya Ichiki, Takayuki Matsumoto, Hiroaki Anzai, Ryohei Takeshita, Kodai Abe, Suzuna Ishihara, Takayuki Uozumi, Hitoshi Sato, Awabaikeli Rousuli, Shigenori Ueda, Yukihiro Taguchi, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Suguru Hamano, Akihiro Mitsuda, Hirofumi Wada, Kojiro Mimura, Valence transition in polycrystalline Eu(Rh_1–xCo_x)₂Si₂ studied by hard x-ray photoemission spectroscopy, Journal of Electron Spectroscopy and Related Phenomena, 10.1016/j.elspec.2017.03.014, 220, 28-32, 2017.10, [URL], We have investigated bulk-derived electronic structure of the valence transition system Eu(Rh_1–xCo_x)₂Si₂ with x = 0 and 0.4 by means of hard x-ray photoemission spectroscopy. The Eu mean valence evaluated from the Eu 3d spectrum for x = 0.4 gradually changes from 2.57 at 300 K to 2.92 at 20 K. On the other hand, the valence for x = 0 retains ∼2.1 in the temperature range from 300 to 20 K. Furthermore, the Eu²⁺ 4f component in the valence band for x = 0.4 was shifted by 150 meV towards the Fermi level compared to that for x = 0. Present results suggest that the increase in the hybridization strength between Eu 4f and conduction electrons induces the valence transition, which is consistent with the Kondo volume collapse model..
27.	Katsuya Ichiki, Kojiro Mimura, Hiroaki Anzai, Takayuki Uozumi, Hitoshi Sato, Yuki Utsumi, Shigenori Ueda, Akihiro Mitsuda, Hirofumi Wada, Yukihiro Taguchi, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Hard x-ray photoemission study of the temperature-induced valence transition system EuNi2(Si1-xGex)2, Physical Review B, 10.1103/PhysRevB.96.045106, 96, 4, 045106-1-045106-7, 2017.07, [URL], We investigated the bulk-derived electronic structure of the temperature-induced valence transition system EuNi2(Si1-xGex)2 (x=0.70, 0.79, and 0.82) by means of hard x-ray photoemission spectroscopy (HAXPES). The HAXPES spectra clearly show distinct temperature dependencies in the spectral intensities of the Eu2+ and Eu3+3d components. For x=0.70, the changes in the Eu2+ and Eu3+3d spectral components with temperature reflect a continuous valence transition, whereas the sudden changes for x=0.79 and 0.82 reflect first-order valence transitions. The Eu 3d spectral shapes for all x and particularly the drastic changes in the Eu3+3d feature with temperature are validated by a theoretical calculation based on the single-impurity Anderson model (SIAM). SIAM analysis reveals that the valence transition for each x is controlled by the c-f hybridization strength and the charge-transfer energy. Furthermore, the c-f hybridization strength governs the valence transition of this system, which is either first order or continuous, consistent with Kondo volume collapse..
28.	T. Koyama, F. Ueyama, T. Maruyama, K. Ueda, T. Mito, Akihiro Mitsuda, Hirofumi Wada, NMR studies on EuNi₂Si₂ with trivalent Eu ion, Journal of Physics: Conference Series, 10.1088/1742-6596/868/1/012023, 868, 1, 012023-1-012023-6, 2017.07, [URL], We have performed ²⁹Si nuclear magnetic resonance experiment to investigate microscopic magnetic properties of EuNi₂Si₂ with trivalent Eu ion. The temperature dependence of the nuclear spin-lattice relaxation rate 1/T ₁ can be explained by considering the two relaxation processes: conduction electrons and the thermally activated spins in the excited levels of J-multiplet. The temperature dependence of the Knight shift could roughly be reproduced with the spin-orbit coupling constant estimated from 1/T ₁..
29.	Hiroaki Anzai, Katsuya Ichiki, Eike F. Schwier, Hideaki Iwasawa, Masashi Arita, Hitoshi Sato, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Akihiro Mitsuda, Hirofumi Wada, Kojiro Mimura, Observation of the c-f hybridization effect in valence-transition system EuPtP, Physica Status Solidi (C) Current Topics in Solid State Physics, 10.1002/pssc.201600185, 14, 6, 1600185-1-1600185-3, 2017.06, [URL], We study the electronic structure of EuPtP, which exhibits two first-order valence transitions at T₁ = 247 K and T₂ = 201 K, using angle-resolved photoemission spectroscopy. Below T₂, we observe an energy gap at the crossing point of the bulk Eu 4f and conduction bands. The shape of band dispersions is described by a hybridization-band picture based on the periodic Anderson model. Our results demonstrate the c-f hybridization effect in the low-temperature phase of EuPtP..
30.	Hiromasa Yasumura, Yasuo Narumi, Tetsuya Nakamura, Yoshinori Kotani, Akira Yasui, Eigo Kishaba, Akihiro Mitsuda, Hirofumi Wada, Koichi Kindo, Hiroyuki Nojiri, 40T soft X-ray spectroscopies on magnetic-field-induced valence transition in Eu(Rh_1-xIr_x)₂Si₂ (x = 0.3), Journal of the Physical Society of Japan, 10.7566/JPSJ.86.054706, 86, 5, 054706-1-054706-8, 2017.05, [URL], A magnetic-field-induced valence transition of Eu(Rh_1-xIr_x)₂Si₂ (x = 0.3) has been examined using soft X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements up to 39.3 T. At 9K, the Eu valence number takes a value of 2.65 (±0.03) at 0 T and decreases abruptly to 2.33 (±0.03) at the transition around 22 T. Above the transition field, the magnetization of the Eu²⁺ component saturates, although the Van Vleck paramagnetism of the Eu³⁺ linearly increases and reaches 0.65 μB=Eu³⁺ at 39 T. The valence determined by XAS and the saturation value of the bulk magnetization are mutually consistent. It is found that the transition field determined by XMCD differs from that of the bulk magnetization. To interpret the discrepancy, we discuss the sample inhomogeneity and the effect of the surface state..
31.	Taisuke Aoyama, Tetsuro Kubo, Haruki Matsuno, Hisashi Kotegawa, Hideki Tou, Akihiro Mitsuda, Yutaro Nagano, Nobutaka Araoka, Hirofumi Wada, Yuh Yamada, NMR studies of coexistence of superconductivity and CDW in LaPt₂Si₂, Journal of Physics: Conference Series, 10.1088/1742-6596/807/6/062002, 807, 6, 062002-1-062002-5, 2017.04, [URL], We carried out ¹³⁹La-, ²⁹Si- and ¹⁹⁵Pt-NMR measurements of LaPt₂Si₂ which shows coexistence of a superconducting state and a charge density wave (CDW) state. Slight gradual decreasing ∼0.006% are observed in Knight shifts of ¹³⁹La and ²⁹Si-line C from 200K to 5K. The decreasing are much less than the previous ¹⁹⁵Pt-NMR spectra PeakD's shifts reported in T. Kubo et al, so the decreasing can be expected following ¹⁹⁵Pt-Knight shift decreasing. LaPt₂Si₂ has two types of Pt-sites: Pt(1)2a(Wycoff position) and Pt(2)2c. By carrying out single crystalline ¹⁹⁵Pt-NMR, the site assignments of ¹⁹⁵Pt-NMR spectra to each respective Pt sites are succeeded for both H\|\|a and \|\|c. Associating for 1/T₁T results for polycrystalline powder reported by T. Kubo et al, Pt(1)-site may contributes to the CDW order below T∗. It is necessary to measure the temperature dependences of line1's 1/T₁T by using single crystalline LaPt₂Si₂..
32.	H. Anzai, K. Ichiki, E. F. Schwier, H. Iwasawa, K. Shimada, H. Namatame, M. Taniguchi, Akihiro Mitsuda, Hirofumi Wada, K. Mimura, Temperature-dependent electronic structure of EuNi₂P₂ revealed by angle-resolved photoemission spectroscopy, Journal of Physics: Conference Series, 10.1088/1742-6596/807/1/012006, 807, 1, 012006-1-012006-5, 2017.04, [URL], We studied the electronic structure of EuNi₂P₂, which exhibits both heavy-fermion and mixed-valence behaviors, using angle-resolved photoemission spectroscopy. Multiple Ni 3d bands were observed near the Fermi energy, and one of them forms a hole-like Fermi surface around the X point of the Brillouin zone. We also found that the spectral weight of the Ni 3d states is rapidly enhanced with decreasing temperature, which is consistent with the temperature dependence of the mean valence of Eu ions. Our results thus demonstrate hybridization between the Ni 3d and Eu 4f electrons in EuNi₂P₂..
33.	Akihiro Mitsuda, Takumi Fujimoto, Eigo Kishaba, Suguru Hamano, Akihiro Kondo, Koichi Kindo, Hirofumi Wada, Large magnetoresistance and volume expansion associated with valence transition in Eu(Rh_1-xIr_x)₂Si₂, Journal of the Physical Society of Japan, 10.7566/JPSJ.85.124703, 85, 12, 124703-1-124703-6, 2016.12, [URL], We report lattice parameters as a function of temperature, magnetization curves, and magnetoresistance of polycrystalline samples of Eu(Rh_1-xIr_x)₂Si₂. The lattice parameters a and c for x = 0.3, 0.4, and 0.5 jump at around the valence transition temperature T_v. For these samples, the high-temperature (larger a, c) and low-temperature (smaller a, c) phases, the volume fraction of which changes with temperature, coexist at around T_v, which means that the valence transition is of the first order. The magnetization curves of x = 0.3, 0.4, and 0.5 at T = 4.2 K exhibit a metamagnetic transition with a large hysteresis, implying a first-order field-induced valence transition. The transition field B_v is proportional to T_v, B_v = αT_v with α = 0.36 T=K. For x = 0.3, a large negative magnetoresistance associated with the field-induced valence transition is observed. The origin of the negative magnetoresistance is discussed..
34.	Masaki Sugishima, Akihiro MITSUDA, Hirofumi Wada, Akihiro Kondo, Koichi Kindo, Large magnetoresistance of EuPtP1-xAsx, Physica Status Solidi (b), 10.1002/pssb.201552370, 252, 12, 2784-2788, 2015.12.
35.	T. Koyama, T. Maruyama, K .Ueda, T. Mito, Akihiro MITSUDA, M. Umeda, M. Sugishima, Hirofumi Wada, Zero-field NMR and NQR studies of magnetically ordered state in charge-ordered EuPtP, Physical Review B, 10.1103/PhysRevB.91.094419, 91, 094419-1-094419-4, 2015.03.
36.	T. Hasegawa, N. Ogita, Akihiro MITSUDA, M. Sugishima, Hirofumi Wada, S. Tsutsui, M. Udagawa, Valence-lattice interaction on YbPd, Journal of Physics: Conference Series, 10.1088/1742-6596/592/1/012061, 592, 012061-1-012061-6, 2015.03.
37.	T. Mito, K. Nishitani, T. Koyama, H. Muta, T. Maruyama, G. Pristas, K. Ueda, T. Kohara, Akihiro MITSUDA, M. Sugishima, Hirofumi Wada, NMR studies of ordered structures and valence states in the successive valence-transition system EuPtP, Physcal Review B, 10.1103/PhysRevB.90.195196, 90, 195106-1-195106-6, 2014.11.
38.	K. Ichiki, K. Mimura, H. Anzai, T. Uozumi, E. Matsuyama, S. Motonami, H. Sato, Y. Utsumi, S. Ueda, A. Mitsuda, H. Wada, Y. Taguchi, K. Shimada, H. Namatame, M. Taniguchi, Temperature-Induced Valence Transition of EuNi2(Si1–xGex)2 : Hard X-ray Photoemission Study, Proceedings of the 18 the Hiroshima International Symposium on Synchrotron Radiation, 127-128, 2014.11.
39.	Akihiro MITSUDA, Masaki Sugishima, Takumi Hasegawa, Satoshi Tsutsui, Alfred Q. R. Baron, Masayuki Udagawa, Hirofumi Wada, Inelastic X-ray Scattering of Valence Fluctuating YbPd, JPS Conference Proceedings, 10.7566/JPSCP.3.011037, 3, 011037-1-011037-5, 2014.06.
40.	T. Kubo, Y. Kizaki, H. Kotegawa, H. Tou, Y. Nagano, N. Araoka, Akihiro MITSUDA, Hirofumi Wada, Structural phase transition and superconductivity in LaPt2Si2: 139La- and 195Pt-NMR studies, JPS Conference Proceedings, 10.7566/JPSCP.3.017031, 3, 017031-1-017031-6, 2014.06.
41.	Akihiro MITSUDA, Suguru Hamano, Hirofumi Wada, Valence transition induced by pressure and magnetic field in antiferromagnet EuRh2Si2, Journal of the Korean Physical Society, 10.7566/JPSJ.82.064715, 62, 1787-1791, 2013.07.
42.	Masaki Sugishima, Akihiro MITSUDA, Hirofumi Wada, Phase diagram and Eu valence state in EuPtP1-xAsx, Journal of the Korean Physical Society, 10.3938/jkps.62.2019, 62, 2019-2023, 2013.07.
43.	Akihiro MITSUDA, Sugishima Masaki, Takumi Hasegawa, Satoshi Tsutsui, Masahiko Isobe, Yutaka Ueda, Masayuki Udagawa, Hirofumi Wada, Origins of Phase Transitions in Valence Fluctuating YbPd, Journal of Physical Society of Japan, 10.7566/JPSJ.82.084712, 82, 084712-1-084712-5, 2013.07.
44.	Yutaro Nagano, Nobutaka Araoka, Akihiro MITSUDA, Hirofumi Wada, Hideki Yayama, Masaki Ichihara, Masahiko Isobe, Yutaka Ueda, Charge density wave and superconductivity of RPt2Si2 ( R = Y, La, Nd and Lu ), Journal of the Physical Society of Japan, 10.7566/JPSJ.82.064715, 82, 064715-1-064715-5, 2013.06.
45.	Tetsuya Nakamura, Toko Hirano, Toyohiko Kinoshita, Yasuo Narumi, Misaki Hayashi, Hiroyuki Nojiri, Akihiro MITSUDA, Hirofumi Wada, Kenji Kodama, Koichi Kindo, Akio Kotani, Soft-X-ray Magnetic Circular Dichroism under Pulsed High Magnetic Fields at Eu M-4,M-5 Edges of Mixed Valence Compound EuNi2(Si0.18Ge0.82)(2), JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/JPSJ.81.103705, 81, 10, 103705-1-103705-4, 2012.10.
46.	A. Mitsuda, S. Hamano, N. Araoka, H. Yayama, H. Wada, Pressure-Induced Valence Transition in EuRh2Si2, Journal of the Physical Society of Japan, 10.1143/JPSJ.81.023709, 81, 023709-1-4, 2012.02.
47.	A. Mitsuda, T. Okuma, M. Sugishima, H. Wada, K. Sato, K. Kindo, Field-induced valence transition in EuPtP1-xAsx, The European Physical Journal B, 10.1140/epjb/e2011-20807-4, 85, e2011-20807-1-5, 2012.02.
48.	Shinya Ueda, Soichiro Takeda, Shiro Takano, Akihiro Mitsuda, and Michio Naito, Molecular Beam Epitaxy Growth of Superconducting Ba1-xKxFe2As2 and SmFeAs(O,F) Films, Japanese Journal of Applied Physics, 10.1143/JJAP.51.010103, 51, 010103-1-10, 2012.01.
49.	H. Hayashi, N. Kanai, Y. Takehara, N. Kawamura, M. Mizumaki, A. Mitsuda, Oxidation state sensitivity of Eu Lγ4 emission and its applications to oxidation state selective EXAFS spectroscopy of EuPd2Si2, Journal of Analytical Atomic Spectroscopy, 10.1039/c1ja10089k, 26, 1858-1862, 2011.08.
50.	Yoshiki Nakanishi, Toru Kamiyama, Kazuhisa Deto, Fumitaka Shichinomiya, Reiko Kashiwazaki, Mitsuteru Nakamura, Masahito Yoshizawa, Masaki Sugishima, Akihiro MITSUDA, Hirofumi Wada, Detailed investigation of elastic properties of YbPd single crystal, Journal of the Physical Society of Japan, 10.1143/JPSJS.80SA.SA093, 80, SA093-1-3, 2011.07.
51.	Masaki Sugishima, Kenji Yamada, Akihiro MITSUDA, Hirofumi Wada, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Ken-ichi Suga, Koichi Kindo, Effects of Magnetic Field, Pressure and Dilution of Yb on Phase Transitions in Valence Fluctuating Compound YbPd, Journal of the Physical Society of Japan, 10.1143/JPSJS.80SA.SA094, 80, SA094-1-3, 2011.07.
52.	A. Mitsuda, T. Matoba, S. Seike, F. Ishikawa, Y. Yamada, H. Wada, Effect of substitution of Ca2+ for Eu2+ on pressure-induced superconductivity in EuFe2As2, Journal of the Physical Society of Japan, 10.1143/JPSJS.80SA.SA117, 80, SA117-1-3, 2011.07.
53.	T. Hasegawa, N. Ogita, M. Sugishima, A. Mitsuda, H. Wada and M. Udagawa, Raman scattering investigation on YbPd, Journal of the Physical Society of Japan, 10.1143/JPSJS.80SA.SA095, 80, SA095-1-3, 2011.07.
54.	Kojiro Mimura, Takayuki Uozumi, Takahiko Ishizu, Satoru Motonami, Hitoshi Sato, Yuki Utsumi, Shigenori Ueda, Akihiro MITSUDA, Kenya Shimada, Yukihiro Taguchi, Yoshiyuki Yamashita, Hideki Yoshikawa, Hirofumi Namatame, Masaki Taniguchi, Keisuke Kobayashi, Temperature-Induced Valence Transition of EuPd2Si2 Studied by Hard X-ray Photoelectron Spectroscopy, Japanese Journal of Applied Physics, 10.1143/JJAP.50.05FD03, 50, 05FD03-1-2, 2011.05.
55.	A. Mitsuda, S. Seike, T. Matoba, H. Wada, F. Ishikawa, Y. Yamada, Competition between Fe-based superconductivity and antiferromagnetism of Eu2+ in Eu1-xCaxFe2As2, J. Phys. Conf. Series, 273, 012100, 2011.03.
56.	T. Hasegawa, N. Ogita, M. Sugishima, A. Mitsuda, H. Wada, M. Udagawa, Low temperature phase of YbPd investigated by Raman scattering, J. Phys. Conf. Series, 273, 012030, 2011.03.
57.	Y. Nakanishi, T. Kamiyama, K. Ito, M. Nakamura, M. Sugishima, A. Mitsuda, H. Wada, M. Yoshizawa, Elastic anomalies associated with possible charge order and other transitions in mixed-valent YbPd, Chinese Journal of Physics, 49, 462, 2011.02.
58.	T. Inami, S. Michimura, A. Mitsuda, H. Wada, Observation of two charge ordering transitions in the valence-fluctuating EuPtP by resonant x-ray diffraction, Phys. Rev. B, 82, 195133, 2010.11.
59.	M. Sugishima, K. Yamada, A. Mitsuda, H. Wada, K. Matsubayashi, Y. Uwatoko, K. Suga and K. Kindo, Effects of magnetic field and pressure on the intermediate valence state of YbPd, J. Phys. Condens. Matter, 22, 375601-1-6, 2010.08.
60.	Soichiro Takeda, Shinya Ueda, Takeshi Yamagishi, Shinya Agatsuma, Shiro Takano, Akihiro Mitsuda, Michio Naito, Molecular Beam Epitaxy Growth of Superconducting Sr1-xKxFe2As2 and Ba1-xKxFe2As2, Appl. Phys. Express, 3, 093101-1-3, 2010.08.
61.	Akihiro Mitsuda, Tomohiro Matoba, Fumihiro Ishikawa, Yuh Yamada, and Hirofumi Wada, Pressure-Induced Superconductivity in Eu0.5Ca0.5Fe2As2 : Wide Zero-Resistivity Region Due to Suppression of Eu Magnetic Order and Chemical Pressure, J. Phys. Soc. Jpn., 10.1143/JPSJ.79.073704, 79, 7, 073704-1-073704-4, 2010.07.
62.	A. Mitsuda, T. Okuma, K. Sato, K. Suga, Y. Narumi, K. Kindo, H. Wada, Pressure and magnetic field dependence of valence and magnetic transitions in EuPtP, J. Phys.: Condens. Matter, 22, 226003-1-6, 2010.05.
63.	Osamu SADAKUNI, Akihiro MITSUDA, and Hirofumi WADA, Magnetocaloric Effect of Co(S1-xSex)2 under High Pressure, J. Phys. Soc. Jpn., 79, 2, 024701, 2010.02.
64.	Akihiro Mitsuda, Toshiya Okuma, Hirofumi Wada, Keisuke Sato, Koichi Kindo, Effect of magnetic field on the two valence transitions in EuPtP, J. Phys. Conf. Ser., 200, 1, 012119-1-012119-4, 2010.01.
65.	Y. H. Matsuda, J. L. Her, T. Inami, K. Ohwada, Z. W. Ouyang, K. Okada, H. Nojiri, A. Mitsuda, H. Wada, N. Kawamura, M. Suzuki, High-Magnetic-Field XMCD as a Novel Tool for the Study of Valence Fluctuation Phenomena—Application to Eu-based Intermetallic Compounds, J. Low Temp. Phys., 159, 292-296, 2010.01.
66.	Y. H. Matsuda, J. L. Her, T. Inami, K. Ohwada, Z. W. Ouyang, K. Okada, H. Nojiri, A. Mitsuda, H. Wada, K. Yoshimura, H. Amitsuka, N. Kawamura, M. Suzuki, A. Kotani, XMCD spectroscopy on valence fluctuating and heavy fermion compounds in very high magnetic fields up to 40 T, Journal of Physics: Conference Series, 190, 012019, 2009.11.
67.	A. Mitsuda, K. Yamada, M. Sugishima, H. Wada, Pressure effect on valence fluctuation and magnetic ordering in YbPd, Physica B, vol. 404, p.3002-3004, 2009.10.
68.	Y. H. Matsuda, Z.W. Ouyang, H. Nojiri, T. Inami, K. Ohwada, M. Suzuki, N. Kawamura, A. Mitsuda, H. Wada, X-Ray Magnetic Circular Dichroism of a Valence Fluctuating State in Eu at High Magnetic Fields, Phys. Rev. Lett., Vol.103, p.046402-1-4, 2009.07.
69.	Fumihiro Ishikawa, Naoya Eguchi, Michihiro Kodama, Koji Fujimaki, Mari Einaga, Ayako Ohmura, Atsuko Nakayama, Akihiro Mitsuda, and Yuh Yamada, Zero-resistance superconducting phase in BaFe2As2 under high pressure, Phys. Rev. B, vol. 79, p.172506-1-3, 2009.05.
70.	H. Wada, S. Matsuo, and A. Mitsuda, Pressure dependence of magnetic entropy change and magnetic transition in MnAs$_{1-x}$Sb$_x$, Phys. Rev. B, vol. 79, p.092407-1-4, 2009.03.
71.	Yasuhiro H. MATSUDA, Toshiya INAMI, Kenji OHWADA, Yuto MURATA, Hiroyuki NOJIRI, Youichi MURAKAMI, Akihiro MITSUDA, Hirofumi WADA, Hiroshi MIYAZAKI, and Isao HARADA, High-Magnetic-Field X-ray Absorption Spectroscopy of Field-Induced Valence Transition in EuNi2(Si1-xGex)2, Journal of the Physical Society of Japan, Vol. 77, No. 5, p.054713-1-7, 2008.05.
72.	A. Mitsuda, Y. Ikeda, N. Ietaka, S. Fukuda, Y. Isikawa, Transport properties accompanied by collapse of antiferromagnetism of Eu(Pt$_{1-x}$Ni$_x$)$_2$Si$_2$, Physica B, vol. 403, p. 1567-1569, 2008.04.
73.	Akihiro Mitsuda, Kiyonori Yamauchi, Naohito Tsujii, Kazuyoshi Yoshimura, Yosikazu Isikawa, Yuh Yamada, Electrical resistivity of heavy fermion cubic YbCu5 under high pressure, J. Phys. Soc. Jpn., Vol. 76, Suppl. A, p78-79, 2007.09.
74.	Tsuyoshi Ikeno, Akihiro Mitsuda, Toshio Mizushima, Tomohiko Kuwai, Yosikazu Isikawa, and Ichiro Tamura, Origin of weak ferromagnetism in YbxFe4Sb12, relationship between weak ferromagnetism and filling ratio x, J. Phys. Soc. Jpn., Vol. 76, p.024708-1-7, 2007.02.
75.	Y. Ikeda, A. Mitsuda, N. Ietaka, T. Mizushima, Y. Isikawa, T. Kuwai, Transport properties under high pressure of antiferromagnet EuPt2Si2 with unstable Eu valence, J. Magn. Magn. Matter., Vol.310, p.e62-e64, 2007.01.
76.	T. Ikeno, A. Mitsuda, T. Kuwai, T. Mizushima, Y. Isikawa, I. Tamura, Effect of filling ratio x of YbxFe4Sb12 single crystals on weak-ferromagnetic transition, J. Magn. Magn. Matter., Vol.310, p.e298-e300, 2007.01.
77.	T. Kuwai, H. Suzuki, T. Saitoh, T. Nambu, A. Mitsuda, T. Mizushima, Y. Isikawa, Possibility of Kondo effect in diluted EuPd2Si2 systems with constant lattice volume, J. Magn. Magn. Matter., Vol.310, p.e68-e70, 2007.01.
78.	A. Mitsuda, Y. Ikeda, N. Ietaka, S. Fukuda, Y. Isikawa, Collapse of antiferromagnetism induced by Ni-substitution in Eu(Pt1-xNix)2Si2, J. Magn. Magn. Matter., Vol.310, p.319-321, 2007.01.
79.	H. Wada, A. Mitsuda, K. Tanaka, Magnetic entropy change of itinerant electron metamagnetism system Co(S1-xSex)2, Phys. Rev. B, Vol.74, p.214407-1-5, 2006.12.
80.	T. Kuwai, P. Sun, T. Sugihara, H. Suzuki, M. Takeuchi, T. Mizushima, A. Mitsuda, Y. Isikawa, T. Fukuhara, Thermoelectric properties of Ce(Ni,Pd)2Ge2 at low temperatures below 1 K, Physica B, Vol.378-380, p.146-147, 2006.01.
81.	T. Ikeno, Y. Isikawa, T. Kuwai, A. Mitsuda, T. Mizushima, Non-magnetic-doublet ground state in PrInCu2: Enhancement of the specific heat coefficient at low temperatures, Physica B, Vol.378-380, p.677-678, 2006.01.
82.	A. Mitsuda, K. Yamauchi, N. Tsujii, K. Yoshimura, T. Mizushima, Y. Isikawa, Thermoelectric power of heavy-Fermion system YbCu5-xAgx, Physica B, Vol.378-380, p.742-743, 2006.01.
83.	A. Mitsuda, H. Mihonmatsu, M. Yamada, H. Ohta, W. Zhang, K. Yoshimura, T. Goto, O. Kolomiyets, Y. Isikawa, Weak ferromagnetism stabilized by pressure and substitution of Y for Yb in YbInCu4, Physica B, Vol.359-361, p.229-231, 2005.01.
84.	Kojiro Mimura, Yukihiro Taguchi, Shuichi Fukuda, Akihiro Mitsuda, Junji Sakurai, Kouichi Ichikawa, Osamu Aida, Bulk-sensitive high-resolution photoemission study of a temperature-induced valence transition system EuPd2Si2., J. Electron Spectrosc., Vol.137-140, p.529-533, 2004.01.
85.	Kojiro Mimura, Yukihiro Taguchi, Shuichi Fukuda, Akihiro Mitsuda, Junji Sakurai, Kouichi Ichikawa, Osamu Aida, Temperature dependence of Eu 4f states in EuPd2Si2: bulk-sensitive high-resolution photoemission study., Physica B, Vol.351, p.292-294, 2004.01.
86.	A. Mitsuda, T. Ikeno, Y. Nakanuma, T. Kuwai, Y. Isikawa, W. Zhang, K. Yoshimura, Transport properties of Yb0.8Y0.2InCu4 under high pressure., J. Magn. Magn. Mater., Vol.272-276, p.56-57, 2004.01.
87.	Y. Isikawa, D. Kato, A. Mitsuda, T. Mizushima, T. Kuwai, Magnetic properties of single crystals of RCoIn5 (R = Tb, Dy, Ho, Er, Yb), J. Magn. Magn. Mater., Vol.272-276, p.635-636, 2004.01.
88.	Shuichi FUKUDA, Yuji NAKANUMA, Junji SAKURAI, Akihiro MITSUDA, Yosikazu ISIKAWA, Fumihiro ISHIKAWA, Tsuneaki GOTO and Takashi YAMAMOTO, Application of Doniach Diagram on Valence Transition in EuCu2(SixGe1-x)2, J. Phys. Soc. Jpn., Vol.72, p.3189-3196, 2003.01.
89.	Hirofumi WADA, Akihiro MITSUDA, Tomoko YOSHIDA, Takashi YAMAMOTO and Tsunehiro TANAKA, Intermediate Valence State of La0.9Eu0.1Ni2(Si1-xGex)2 Compounds, J. Phys. Soc. Jpn., Vol.72, p.2604-2607, 2003.01.
90.	Junji Sakurai, Yuji Nakanuma, Shuichi Fukuda, Akihiro Mitsuda and Yosikazu Isikawa, Valence Transition between Eu2+ State and Eu3+ State in EuxY1-xPd2Si2 and EuxLa1-xPd2Si2., J. Phys. Soc. Jpn., Vol.72, p.2046-2052, 2003.01.
91.	Wei Zhang, Nobutaka Sato, Kazuyoshi Yoshimura, Koji Kosuge, Akihiro Mitsuda, N. V. Mushnikov and Tsuneaki Goto, Valence Transition in the Intermetallic Compound System Yb1-xYxInCu4., Journal of the Japan Society of Powder and Powder Metallurgy, 50, 91-92, 2003.01.
92.	S. Fukuda, Y. Nakanuma, A. Mitsuda, Y. Isikawa, J. Sakurai, Magnetic properties and Eu Valence in EuCu2(SixGe1-x)2, Acta Physica Polonica B, Vol.34, p.1177-1180, 2003.01.
93.	A. Mitsuda, T. Goto, N. Takeshita, N. Mori, H. Wada, M. Shiga, Magnetic and transport properties of EuPt2Si2 under high pressure, Acta Physica Polonica B, Vol.34, p.1149-1152, 2003.01.
94.	Wei Zhang, Kazuyoshi Yoshimura, Akihiro Mitsuda, Nikolay V. Mushnikov, Tsuneaki Goto, Effect of Pressure on Yb1-xYxInCu4 with First-order Valence Transition, Physica B, Vol.329-333, p.603-604, 2003.01.
95.	A. Mitsuda, T. Goto, K. Yoshimura, W. Zhang, N. Sato, K. Kosuge and H. Wada, Collapse of Valence Transition in Yb0.8Y0.2InCu4 : Pressure-Induced Weak Ferromagnetism., Phys. Rev. Lett., Vol.88, p.137204-1-4, 2002.04.
96.	Hiroya Sakurai, Noriko Tsuboi, Masaki Kato, Kazuyoshi Yoshimura, Koji Kosuge, Akihiro Mitsuda, Hiroyuki Mitamura, and Tsuneaki Goto, Antiferromagnetic order in the two-dimensional spin system Cu3B2O6, Phys. Rev. B, Vol.66, p.024428-1-6, 2002.01.
97.	W. Zhang, N. Sato, K. Yoshimura, A. Mitsuda, T. Goto, and K. Kosuge, Effect of pressure and substitution for Yb on the first-order valence transition in YbInCu4., Phys. Rev. B, Vol.66, p.024112-1-8, 2002.01.
98.	Shin-ichi Kimura, Mitsuru Okuno, Hideki Iwata, Tomohiko Saitoh, Taichi Okuda, Ayumi Harasawa, Toyohiko Kinoshita, Akihiro Mitsuda, Hirofumi Wada and Masayuki Shiga, Temperature-Induced Valence Transition of EuNi2(Si0.25Ge0.75)2 Studied by Eu 4d-4f Resonant Photoemission and Optical Conductivity., J. Phys. Soc. Jpn, Vol.71, p.255-257, 2002.01.
99.	Dexuan Huo, Akihiro Mitsuda, Yosikazu Isikawa, Junji Sakurai, Hironori Sakai, Hiroyuki Ohno, Masaki Kato, Kazuyoshi Yoshimura, Shinsaku Kambe and Russell E. Walstedt, Thermoelectric power of the superconducting pyrochlore Cd2Re2O7., J. Phys. : Condens. Matter, Vol.14, p.L257-L260, 2002.01.
100.	Toyohiko Kinoshita, Heralu Pathirannehelage Nihal Jayalath Gunasekara, Yasutaka Takata, Shin-ichi Kimura, Mitsuru Okuno, Yuichi Haruyama, Nobuhiro Kosugi, Krishna Gopal Nath, Hirofumi Wada, Akihiro Mitsuda, Masayuki Shiga, Taichi Okuda, Ayumi Harasawa, Ha, Spectroscopy Studies of Temperature-Induced Valence Transition on EuNi2(Si1-xGex)2 around Eu 3d-4f, 4d-4f and Ni 2p-3d Excitation Regions., J. Phys. Soc. Jpn., Vol.71, p.148-155, 2002.01.
101.	Seiji Niitaka, Kazuyoshi Yoshimura, Koji Kosuge, Akihiro Mitsuda, Hiroyuki Mitamura, Tsuneaki Goto, Pulsed high field study of new partially disordered antiferromagnetic phase in Ca3CoRhO6, J. Phys. Chem. Solid, Vol.63, p,999-2001, 2002.01.
102.	Hiroya Sakurai, Norihiro Jiko, Kazuyoshi Yoshimura, Koji Kosuge, Akihiro Mitsuda, Fumihiro Ishikawa, Hiroyuki Mitamura, Tsuneaki Goto, New type of frustrated spin chains in KMgxCu5-xV3O13(x=0-1)., J. Phys. Chem. Solid, Vol.63, p.1123-1127, 2002.01.
103.	W. Zhang, N. Sato, K. Yoshimura, A. Mitsuda, H. Mitamura, T. Goto, K. Kosuge, Effect of partial substitution of Yb on Valence Transition in YbInCu4., J. Phys. Chem. Solid, Vol.63, p.1215-1218, 2002.01.
104.	A. Mitsuda, T. Goto, K. Yoshimura, W. Zhang, N. Sato, K. Kosuge, H. Wada, Weak ferromagnetism induced by pressure in Yb0.8Y0.2InCu4., J. Phys. Chem. Solid, Vol.63, p.1211-1213, 2002.01.
105.	H. Sakurai, K. Yoshimura, K. Kosuge, A. Mitsuda, T. Goto, Novel Frustrated Spin Chain System in KCu5V3O13, J. Phys. Soc. Jpn., Vol.70, p.3209-3212, 2002.01.
106.	S. Niitaka, H. Kageyama, K. Yoshimura, K. Kosuge, S. Kawano, N. Aso, A. Mitsuda, H.Mitamura and T. Goto, High-Field Magnetization and Neutron Diffraction Studies of One-Dimensional Compound Ca3CoRhO6, J. Phys. Soc. Jpn., Vol.70, p.1222-1225, 2001.01.
107.	A. Mitsuda, T. Goto, H. Wada and M Shiga, Field-induced valence transition under high pressure in EuNi2(Ge1-xSix)2., J. Magn. Magn. Mater., Vol.226-230, p.167-169, 2001.01.
108.	M. Shiga, A. Mitsuda, H. Wada, V V. Paltonov, O. M. Tatsenko, V. D. Selemir and R Z. Levitin, Field-induced valence transition of EuNi2(Si1-xGex)2 in ultra-high magnetic fields., Physica B, Vol.294-295, p.262-266, 2001.01.
109.	H. Wada, H. Gomi, A. Mitsuda and M. Shiga, Specific heat anomaly due to valence transition in Eu(Pd1-xPtx)2Si2., Solid State Commun., Vol.117, p.703-707, 2001.01.
110.	A. Mitsuda, H. Wada, M. Shiga and T. Tanaka, The Eu valence state and valence transition in Eu(Pd1-xPtx)2Si2., J. Phys. : Condens. Matter, Vol.12, p.5287-5296, 2000.01.
111.	J. Sakurai, S. Fukuda, A. Mitsuda, H. Wada and M. Shiga, Thermoelectric power of EuNi2(Si1-xGex)2, Physica B, Vol.281&282, p.134-135, 2000.01.
112.	H. Wada, A. Mitsuda, A. Nakamura, M. Shiga and J. D. Thompson, Resistivity anomaly due to valence transition in Eu compounds., Physica B, Vol.281&282, p.132-133, 2000.01.
113.	A. Mitsuda, H. Wada, M. Shiga, H. Mitamura and T. Goto, Volume magnetostriction of valence fluctuating compounds EuNi2(Si1-xGex)2, Physica B, Vol.281&282, p.130-131, 2000.01.
114.	A. Mitsuda, H. Wada, M. Shiga, H. Aruga Katori, H. Mitamura and T. Goto, Field-induced valence transition of EuPd2Si2 and related compounds., J. Magn. Magn. Mater., Vol.196-197, p.883-884, 1999.01.
115.	H. Wada, T. Sakata, A. Nakamura, A. Mitsuda, M. Shiga, Y. Ikeda and Y. Bando, Thermal Expansion and Electrical Resistivity of EuNi2(Si1-xGex)2, J. Phys. Soc. Jpn., Vol.68, p.950-953, 1999.01.
116.	H. Wada, A. Mitsuda, M. Shiga and T. Goto, Magnetic Field Effects on the Valence Transition of Eu-based Compounds, Jpn. J. Appl. Phys., Series 11, p.27-30, 1999.01.
117.	N. Takeshita, N. Mori, A. Mitsuda, H. Wada, M. Shiga, J. L. Sarrao, and J. D. Thompson, Pressure induced valence transition of EuNi2Ge2, AIRAPT-17 Proceedings eds. M. H. Manghnani, W.J. Nellis and M.F. Nicol, (Universities Press, Hyderabad, India), vol.1, p.445-447, 1998.01.
118.	H. Wada, A. Nakamura, A. Mitsuda, M. Shiga, H. Mitamura and T. Goto, Field-induced valence transition of EuNi2(Si1-xGex)2., J. Magn. Magn. Mater., Vol.171-181, p.363-364, 1998.01.
119.	H. Wada, A. Nakamura, A. Mitsuda, M. Shiga, T. Tanaka, H. Mitamura and T. Goto, Temperature- and field-induced valence transition of EuNi2(Si1-xGex)2., J. Phys. : Condens. Matter, Vol.9, p.7913-7923, 1997.01.
120.	H. Wada, A. Mitsuda, M. Shiga, H. Aruga Katori and T. Goto, First-order Valence Transition of EuPd2Si2 Induced by High Magnetic Fields., J. Phys. Soc. Jpn., Vol.65, p.3471-3474, 1996.01.
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