九州大学 研究者情報
論文一覧
和田 裕文(わだ ひろふみ) データ更新日:2021.06.03

教授 /  理学研究院 物理学部門 物性物理学


原著論文
1. 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, Phys. Rev. B, DOI: 10.1103/PhysRevB.103.L041113, 103, 4, L041113 (6 pages), 2021.01, We performed a point contact spectroscopy study in an intermediate-valence heavy-fermion (HF) compound EuNi2P2. Above the Kondo temperature TK, the differential conductance spectra show a broad peak due to the Kondo resonance at the Eu site. Below TK, 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..
2. 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, Phys. Rev. B, DOI: 10.1103/PhysRevB.102.245150, 102, 24, 245150 (9 pages), 2020.12.
3. 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., https://doi.org/10.7566/JPSJ.89.114713, 89, 11, 114713 (7 pages), 2020.10.
4. 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., https://doi.org/10.7566/JPSJ.89.104703, 89, 10, 104703 (5 pages), 2020.09.
5. 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(Si1–xGex)2 investigated by high-energy resolution fluorescence detection X-ray absorption spectroscopy, Radiation Physics and Chemistry, https://doi.org/10.1016/j.radphyschem.2019.02.009, 175, 108150 (4pages), 2020.10.
6. Kohei Oyama, Kousuke Tanabe, Akihiro Mitsuda, Hirofumi Wada, Naohisa Hirao, Saori Imada Kawaguchi, Yasuo Ohishi, Jun Gouchi, and Yoshiya Uwatoko, Pressure-induced Cubic Valence Fluctuating Ground State in YbPd, JPS Conf. Proc., https://doi.org/10.7566/JPSCP.30.011141, 30, 011141 (6 pages), 2020.03.
7. Y. Nakai, R. Nakanishi, T. Fujii, M. Hirata, K. Oyama, A. Mitsuda, K. Ueda, H. Wada, and T. Mito, Development of Low-Energy Fluctuations Toward Structural Transition in YbPd Inferred from 105Pd NMR, JPS Conf. Proc., https://doi.org/10.7566/JPSCP.30.011140, 30, 011140 (4 pages), 2020.03.
8. Masanobu Shiga, Takurou Harada, Takuya Takahashi, Akihiro Mitsuda, Hirofumi Wada, Yuji Inagaki, and Tatsuya Kawae, Point-Contact Spectroscopy Study of YbPd/W Interface, JPS Conf. Proc., https://doi.org/10.7566/JPSCP.30.011139, 30, 011139 (6 pages), 2020.03.
9. Ryohei Shimokasa, Naomi Kawamura, Taku Kawabata, Gen Isumi, Takayuki Uozumi, Akihiro Mitsuda, Hirofumi Wada, Fuminori Honda, Masato Hedo, Takao Nakama, Yoshichika Onuki, Masaichiro MIzumaki, and Kojiro Mimura, Electronic Structure of the Valence Transition System Eu(Rh1–xTx)2Si2 (T = Co, Ir) Studied by High-Energy Resolution Fluorescence Detection X-Ray Absorption Spectroscopy, JPS Conf. Proc. , https://doi.org/10.7566/JPSCP.30.011134, 30, 011134 (6 pages), 2020.03.
10. Masanobu Shiga, Kengo Okimura, Hiroki Takata, Akihiro Mitsuda, Isao Maruyama, Hirofumi Wada, Yuji Inagaki, and Tatsuya Kawae, Observation of Kondo resonance in valence-ordered YbPd, Physical Review B, https://doi.org/10.1103/PhysRevB.100.245117, 100, 245117 (7 pages), 2019.12, [URL].
11. 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(Si0.21Ge0.79)2 studied via time-resolved x-ray absorption spectroscopy, Physical Review B, 10.1103/PhysRevB.100.115123, 100, 11, 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..
12. 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, 2019.10, [URL], Electrical resistivity, magnetoresistance (MR) and Hall resistivity have been measured for Eu-based heavy fermion compound EuNi2P2 (exact composition is Eu1.2Ni2P2.1). 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..
13. Hirofumi Wada, Kosuke Fukuda, Takayuki Ohnishi, Kei Soejima, Kensuke Otsubo, Keiichiro Yamashita, Thermal conductivity of giant magnetocaloric Mn compounds, Journal of Alloys and Compounds, 10.1016/j.jallcom.2019.01.188, 445-451, 2019.05, [URL].
14. 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].
15. 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, 2018.02, [URL].
16. 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, 2018.01, [URL].
17. 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, 2018.01, [URL].
18. 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, 2018.01, [URL].
19. Amina A. Abozeed, Toshiharu Kadono, Akira Sekiyama, Hidenori Fujiwara, Atsushi Higashiya, Atsushi Yamasaki, Yuina Kanai, Kohei Yamagami, Kenji Tamasaku, Makina Yabashi, Tetsuya Ishikawa, Alexander V. Andreev, Hirofumi Wada, Shin Imada, Rare-earth fourth-order multipole moment in cubic ErCo2Probed by linear dichroism in core-level photoemission, Journal of the Physical Society of Japan, 10.7566/JPSJ.87.033710, 87, 3, 2018.01, [URL].
20. 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(Rh1–xCox)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].
21. 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, 2017.07, [URL].
22. 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, 2017.07, [URL].
23. 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, 2017.06, [URL].
24. 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(Rh1-xIrx)2Si2 (x = 0.3), Journal of the Physical Society of Japan, 10.7566/JPSJ.86.054706, 86, 5, 2017.05, [URL].
25. 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, 2017.04, [URL].
26. 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, 2017.04, [URL].
27. Takayuki Ohnishi, Kei Soejima, Keiichiro Yamashita and Hirofumi Wada, Magnetocaloric properties of (MnFeRu)2(PSi) as magnetic refrigerants near room temperature, Magnetochemistry, 10.3390/magnetochemistry3010006, 3, 1, 6 (8 pages), 2017.02.
28. 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(Rh1-xIrx)2Si2, Journal of the Physical Society of Japan, 10.7566/JPSJ.85.124703, 85, 12, 2016.12, [URL].
29. Hirofumi Wada, Michael Lang, Tomoyuki Yamamoto, Masato Yoshiya, Nam Nhat Hoang, Markus Münzenberg, Preface
Proceedings of 2nd International Symposium on Frontiers in Materials Science (FMS2015), AIP Conference Proceedings, 10.1063/1.4961333, 1763, 2016.08, [URL], This is the preface of proceedings of 2nd International Symposium on Frontiers in Materials Science (FMS2015) held in Waseda University, Nov. 19-21, 2015..
30. Masahiro Hirashima, Hirofumi Wada, Magnetocaloric properties of (MnFe)2PGe and (MnFe)2PSi compounds fabricated by a melting method, 2nd International Symposium on Frontiers in Materials Science, FMS 2015
Frontiers in Materials Science, FMS 2015
Proceedings of the 2nd International Symposium on Frontiers in Materials Science
, 10.1063/1.4961337, 1763, 2016.08, [URL].
31. Hirofumi Wada, Yoshiro Maekawa, Daichi Kawasaki, High-field transport properties of itinerant electron metamagnetic Co(S1-xSex)2, Journal of Science: Advanced Materials and Devices, 10.1016/j.jsamd.2016.06.001, 1, 2, 179-184, 2016.06, The Co(S1-xSex)2 compounds are known to exhibit itinerant electron metamagnetism (IEM). We present field dependence of electrical resistivity and Hall effect of the compounds with 0 ≤ x < 0.15. It was found that the magnetoresistance shows a positive jump associated with the IEM. This jump is nearly independent of temperature. We also observed a jump in the field dependence of Hall resistivity, which is attributable to the anomalous Hall effect due to the onset of ferromagnetism. Our analyses revealed that the ordinary Hall coefficient decreases considerably by the IEM. These results are discussed in terms of the proposed electronic structure of CoS2, in which a highly spin polarized state is achieved..
32. Masaki Sugishima, Hirofumi Wada, Akihiro Mitsuda, Akihiro Kondo, Koichi Kindo, Large magnetoresistance of EuPtP1-xAsx, Physica Status Solidi (B): Basic Research, 10.1002/pssb.201552370, 2015.12, [URL], High-field magnetization and magnetoresistance of EuPtP1-xAsx with 0.55≤x≤0.70 have been studied. Large negative magnetoresistance associated with the field-induced valence transition was observed. Based on the results, we discuss the nature of the valence transition caused by high magnetic fields. Besides, the compounds exhibit substantial negative magnetoresistance in the low field region below 10T. It is found that the magnetoresistance is proportional to the square of magnetization. The origin of magnetoresistance in the low field region is also discussed..
33. T. Hasegawa, N. Ogita, A. Mitsuda, M. Sugishima, H. Wada, S. Tsutsui, M. Udagawa, Valence-lattice interaction on YbPd, J. Phys: Conf. Ser., 10.1088/1742-6596/592/1/012061, 592, 012061-1-012061-6, 2015.05.
34. Hirofumi Wada, T. Takahara, K. Katagiri, T. Ohnishi, K. Soejima, K. Yamashita, Recent progress of magnetocaloric effect and magnetic refrigerant materials of Mn compounds (invited), Journal of Applied Physics, 10.1063/1.4914120, 117, 17, 2015.05, [URL], Magnetocaloric and related properties of Ru and Ni substituted (MnFe)2(PSi) are presented. It is found that Ru and Ni are effective doping elements to reduce the thermal hysteresis of (MnFe)2(PSi). The origin of the thermal hysteresis is discussed on the basis of a thermodynamic model. It is shown that the elastic energy is responsible for the thermal hysteresis. We also show recent developments of the production process of Mn compounds in an industrial scale..
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 - Condensed Matter and Materials Physics, 10.1103/PhysRevB.91.094419, 91, 9, 2015.03, [URL], EuPtP undergoes two valence transitions and has two kinds of valence states of Eu ions at low temperatures. In the charge-ordered state, this compound shows an antiferromagnetic order ascribed to magnetic divalent Eu ions. We investigated the antiferromagnetically ordered state of EuPtP by nuclear magnetic resonance (NMR) measurement and nuclear quadrupole resonance (NQR) measurement in a zero external magnetic field. The observed Eu153 NMR signals of a magnetic divalent state and Eu151,153 NQR signals of a nonmagnetic trivalent state clearly demonstrate that the spins order in the hexagonal basal plane and the internal magnetic field is not canceled out, even at the Eu3+ layers which are in the middle of magnetic Eu2+ layers. In addition, the observation of 31P and Pt195 NMR spectra allowed us to discuss a possible magnetic structure. We also evaluated the nuclear quadrupole frequencies for both Eu2+ and Eu3+ ion states..
36. T. Mito, K. Nishitani, T. Koyama, H. Muta, T. Maruyama, G. Pristáš, 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, Physical Review B - Condensed Matter and Materials Physics, 10.1103/PhysRevB.90.195106, 90, 19, 2014.11, [URL], We have studied EuPtP, which undergoes two successive valence transitions at TA∼240 K and TB∼200 K by P31-nuclear magnetic resonance (NMR) measurements. From the analysis of NMR spectra, we obtained plausible ordered structures and Eu valence states in three phases divided by TA and TB. These ordered structures well explain observed inequivalent P sites and the intensity ratio of the NMR spectra arising from these P sites. The results are also in good accordance with mean Eu valence measured by the x-ray absorption spectroscopy. We also discuss Eu 4f states and the origin of the transitions from the measurements of nuclear spin lattice relaxation rate and hyperfine coupling constant..
37. Hirofumi Wada, Daichi Kawasaki, Yoshiro Maekawa, Magnetocaloric Effect and Magnetoresistance Due to Itinerant Electron Metamagnetic Transition in Co(S1-xSex)2, IEEE Transactions on Magnetics, 10.1109/TMAG.2014.2303818, 50, 6, 2014.06, [URL], The Co(S1-xSex)2 compounds with the cubic Pyrite structure show itinerant electron metamagnetism for 0.12≤ x. We studied the magnetocaloric effect and magnetoresistance (MR) of this system. It was found that a substantial magnetic entropy change was obtained for Co(S0.88Se0.12)2, which has a paramagnetic ground state. We observed giant positive MR associated with the itinerant electron metamagnetic transition for Co(S1-xSex)2. The magnitude of the MR jump is independent of temperature and concentration for 0.13≤ x≤ 0.15. These results are discussed in terms of a simple band structure of CoS2, in which high-spin polarization is realized in a ferromagnetic state..
38. Tetsuro Kubo, Yasuhide Kizaki, Hisashi Kotegawa, Hideki Tou, Yutaro Nagano, Nobutaka Araoka, Akihiro Mitsuda, Hirofumi Wada, Structural phase transition and superconductivity in LaPt2Si2: 139La- and 195Pt-NMR studies, JPS Conference Proceedings, 10.7566/JPSCP.3.011031, 3, 011031-1-011031-6, 2014.06.
39. Hirofumi Wada, Koshi Nakamura, Kodai Katagiri, Takayuki Ohnishi, Keiichiro Yamashita, Akiyuki Matsushita, Tuning the Curie Temperature and Thermal Hysteresis of Giant Magnetocaloric (MnFe)2PX (X = Ge and Si) Compounds by the Ru Substitution, Jpn. J. Appl. Phys., 10.7567/JJAP.53.063001, 53, 063001, 2014.04.
40. Akihiro Mitsuda, Masaki Sugishima, Takumi Hasegawa, Satoshi Tsutusi, 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.
41. Hirofumi Wada, Akihiro Mitsuda, Masaki Sugishima, Takumi Hasegawa, Satoshi Tsutsui, Masahiko Isobe, Yutaka Ueda, Masayuki Udagawa, Origins of Phase Transitions in Valence Fluctuating YbPd, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.82.084712, 82, 8, 2013.08.
42. Hirofumi Wada, Akihiro Mitsuda, Masaki Sugishima, Phase diagram and Eu valence state in EuPtP1-x As (x), JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 10.3938/jkps.62.2019, 62, 12, 2019-2023, 2013.07.
43. Akihiro Mitsuda, Suguru Hamano, Hirofumi Wada, Valence transition induced by pressure and magnetic field in antiferromagnet EuRh2Si2, JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 10.3938/jkps.62.1787, 62, 12, 1787-1791, 2013.07.
44. Yutaro Nagano, Nobutaka Araoka, Hideki Yayama, Akihiro Mitsuda, Hirofumi Wada, 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, 6, 2013.06.
45. K. Katagiri, K. Nakamura, Hirofumi Wada, Magnetocaloric properties and magnetic refrigerant capacity of MnFeP1-xSix, JOURNAL OF ALLOYS AND COMPOUNDS, 10.1016/j.jallcom.2012.11.127, 553, 286-290, 2013.03.
46. Tetsuya Nakamura, Toko Hirono, 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, 2012.10.
47. M. Miyata, K. Kiseki, Satoshi Yakata, Hirofumi Wada, 木村 崇, Formations of magnetic vortices in a chain array of triangle Py dots and an isosceles triangle Py dot, JOURNAL OF APPLIED PHYSICS, 10.1063/1.3673349, 111, 7, 2012.04.
48. Akihiro MITSUDA, Suguru Hamano, Nobutaka Araoka, Hideki Yayama, Hirofumi Wada, Pressure-Induced Valence Transition in Antiferromagnet EuRh2Si2, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/JPSJ.81.023709, 81, 2, 2012.02.
49. Hirofumi Wada, Akihiro MITSUDA, T. Okuma, M. Sugishima, K. Sato, K. Kindo, Field-induced valence transition in EuPtP1-xAsx, EUROPEAN PHYSICAL JOURNAL B, 10.1140/epjb/e2011-20807-4, 85, 2, 2012.02.
50. Satoshi Yakata, M. Miyata, S. Honda, H. Itoh, Hirofumi Wada, 木村 崇, Chirality control of magnetic vortex in a square Py dot using current-induced Oersted field, APPLIED PHYSICS LETTERS, 10.1063/1.3669410, 99, 24, 2011.12.
51. M. Miyata, S. Nonoguchi, S. Yakata, H. Wada and T. Kimura, Static and dynamical properties of a magnetic vortex in a regular polygonal nanomagnet, IEEE Trans. Mag. , 47, 10, 2505, 2011.10.
52. A. Mitsuda, S. Seike, T. Matoba, H. Wada, F. Ishikawa and Y. Yamada, Competition between Fe-based superconductivity and antiferromagnetism of Eu2+
in Eu1-xCaxFe2As2
, J. Phys: Conf. Ser., 273, 012100, 2011.08.
53. T. Hasegawa, N. Ogita, M. Sugishima, A. Mitsuda, H. Wada and M. Udagawa, Low temperature phase of YbPd investigated by Raman scattering, J. Phys: Conf. Ser., 273, 012030, 2011.08.
54. A. Mitsuda, T. Matoba, S. Seike, F. Ishikawa, Y. Yamada and H. Wada, Effect of substitution of Ca2+ for Eu2+ on pressure-induced superconductivity
in EuFe2As2
, J. Phys. Soc. Jpn., 80, Suppl. A, SA117, 2011.06.
55. Y. Nakanishi, T. Kamiyama, K. Deto, F. Shichinomiya, R. Kashiwazaki, M. Nakamura, M. Yoshizawa, M. Sugishima, A. Mitsuda and H. Wada , Detailed investigation of elastic properties of YbPd single crystal, J. Phys. Soc. Jpn., 80, Suppl. A, SA093, 2011.06.
56. M. Sugishima, K. Yamada, A. Mitsuda, H. Wada, K. Matsubayashi, Y. Uwatoko, K. Suga and K. Kindo , Effects of magnetic field, pressure and dilution of Yb on phase transitions in valence
fluctuating compound YbPd
, J. Phys. Soc. Jpn., 80, Suppl. A, SA094, 2011.06.
57. Y. Nakanishi, T. Kamiyama, K. Ito, M. Nakamura, M. Sugishima, A. Mitsuda, H. Wada and M. Yoshizawa , Elastic anomalies associated with possible charge order and other transitions in
mixed-valent YbPd
, Chin. J. Phys., 462, 2011.04.
58. M. Miyata, S. Yakata, M. Hara, H. Wada and T. Kimura, Control of vortex chirality in polygonal nanomagnets, Proc. IEEE Region 10 Annual Conf. TENCON, 1878, 2010.12.
59. S. Yakata, M. Miyata, S. Nonoguchi, H. Wada and T. Kimura, Control of vortex chirality in regular polygonal nanomagnets using in-plane magnetic field, Appl. Phys. Lett. , 97, 222503, 2010.12.
60. T. Inami, S. Michimura, A. Mitsuda and H. Wada, Observation of two charge ordering transitions in the valence-fluctuation EuptP by resonant x-ray diffraction, Phys. Rev. B, 82, 19, 195133, 2010.11.
61. N. Hirano, S. Nagaya, T. Okamura, T. Kawanami and H. Wada, Development of room temperature magnetic refrigeration in Japan, Proc. Fourth IIF-IIR International Conference on Magnetic Refrigeration
at Room Temperature, Baotou, 2010, Ed. P. Egolf,
, Commission B2, A1 with E2 Keynote 1, 10 pages , 2010.08.
62. M. Sugishima, K. Yamada, A. Mitsuda and H. Wada, Effects of magnetic field and pressure on the intermediate valence state of YbPd, J. Phys: Condens. Matter, 22, 37, 375601, 2011.08.
63. A. Mitsuda, T. Matoba, F. Ishikawa, Y. Yamada and H. 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. Japan , 79, 7, 073704, 2011.07.
64. A. Mitsuda, T. Okuma, K. Sato, K. Suga, Y. Narumi, K. Kindo and H. Wada, Pressure and magnetic field dependence of valence and magnetic transitions in EuPtP, J. Phys: Condens. Matter , 22 , 22, 226003, 2010.05.
65. Y. H. Matsuda, J. L. Her, T. Inami, K. Ohwada, Z. W. Ouyang, K. Okada, H. Nojiri, A. Mitsuda, H. Wada, N. Kawamura and 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, 2010.04.
66. A. Mitsuda, T. Okuma, H. Wada, K. Sato and K. Kindo, Effect of magnetic field on the two valence transitions in EuPtP, J. Phys: Conf. Ser., vol. 200 (2010) 012119 1-4., 2010.03.
67. Youngkook Kim, Hirofumi Wada, Yeonwon Lee and Shigeru Itoh, Magnetization, Magnetic transition and Magnetic entropy changes of bulk
MnAs1-xSbx fabricated by underwater shock compaction
, Mater. Sci. and Eng. B, vol. 167, no. 2, (2010) 114-118., 2010.03.
68. N. Hirano, S. Nagaya, T. Okamura, T. Kawanami and H. Wada , Development of Room Temperature Magnetic Refrigerator –overall plan–, Proc. 2010 International Symposium on Next-generation Air Conditioning
and Refrigeration Technology
, NS08 1-7., 2010.02.
69. H. Wada, K. Sadamatsu, N. Mutsuki, N. Hirano and S. Nagaya , Recent Development of Magnetic Refrigerant Materials near Room Temperature
, Proc. 2010 International Symposium on Next-generation Air Conditioning
and Refrigeration Technology
, P22 1-7., 2010.02.
70. Osamu Sadakuni, Akihiro Mituda and Hirofumi Wada, Magnetocaloric effect of Co(S1-xSex)2 under high pressure, J. Phys. Soc. Japan, vol. 79, no. 2, (2010) 024701 1-5., 2010.02.
71. H. Matsuda, L. Her, T. Inami, K. Ohwada, W. Ouyang, K. Okada, H. Nojiri, A. Mitsuda, H. Wada, K., Yoshimura, H. Amitsuka, N. Kawamura, M. Suzuk and A. Kotani , XMCD spectroscopy on valence fluctuating and heavy fermion compounds in very
high magnetic fields up to 40 T
, J. Phys: Conf. Ser. , vol. 190 (2009) 012019 1-4., 2009.10.
72. Y. H. Matsuda, Z. W. Ouyang, H. Nojiri, T. Inami, K. Ohwada, M. Suzuki, N. Kawamura, A. Mitsuda and H. Wada , X-ray Magnetic Circular Dichroism of a Valence Fluctuating State in Eu at High
Magnetic Fields
, Phys. Rev. Lett., vol. 103 (2009) 046402-1-4., 2009.07.
73. A. Mitsuda, K. Yamada, M. Sugishima and H. Wada, Pressure effect on valence fluctuation and magnetic ordering in YbPd, Physica B, vol. 404 (2009) 3002-3004, 2009.07.
74. H. Wada, S. Matsuo, and A. Mitsuda, Pressure dependence of magnetic entropy change and magnetic transition in MnAs1-xSbx, Phys. Rev. B, vol. 79 (2009) 092407-1-4, 2009.03.
75. Y. H. Matsuda, T. Inami, K. Ohwada, Y. Murata, H. Nojiri, Y. Murakami, A. Mitsuda, H. Wada, H. Miyazaki and I. Harada , High-Magnetic-Field X-ray Absorption Spectroscopy of Field-Induced Valence Transition in EuNi2(Si1-xGex)2
, J. Phys. Soc. Japan, vol.77 no.5 (2008) 054713-1-7, 2008.05.
76. A. Matsumoto, M. Tsunekawa, S. Suga, H. Wada, T. Muro, T. Nakamura, and S. Imada, Electronic and Magnetic States of Mn2.97Co0.03GaC Studied by Soft X-ray Photoemission and Magnetic Circular Dichroism, Jpn. J. Appl. Phys., vol. 47 (2008) 1567-1569., 2008.04.
77. J. D. Zou, H. Wada, B. G. Shen, J. R. Sun and W. Li, Giant Magnetocaloric Effect and Soft-mode Magneto-structural Phase Transition in MnAs, EPL, vol. 81 (2008) 47002-p1 – 47002-p4., 2008.01.
78. M. Tsunekawa, S. Imada,, A. Matsumoto, A. Yamasaki, H. Fujiwara, S. Suga, B. Schmid, H. Higashimichi, T. Nakamura, T. Muro and H. Wada , Soft X-ray magnetic circular dichroism of Ce(Fe0.8Co0.2)2, AIP Conference Proceedings, vol. 879 (2007) 1703-1706, 2007.09.
79. N. Hirano, S. Nagaya, T. Okamura, T. Kawanami and H. Wada, Development of Room Temperature Magnetic Refrigerator –overall plan, Proc. 2nd Int. Conf. on Magnetic Refrigeration at Room Temperature,
Portoroz, Slovenia Ed.A. Poredoš and A. Šarlah , (IIR-IIF, Paris, 2007)
, p281-p287., 2007.04.
80. H. Wada, T. Asano, M. Ilyn and A. M. Tishin, Direct measurements of magnetocaloric effects of Mn1+dAs1-xSbx, J. Magn. Magn. Mater., vol.310 (2007) 2811-2812., 2007.03.
81. H. Wada, A. Mitsuda, and K. Tanaka, Magnetic entropy change of itinerant electron metamagnetic system Co(S1-xSex)2, Phys, Rev. B , vol.74 (2006) 214407-1-5., 2006.12.
82. F. Ishikawa, K. Koyama, K. Watanabe, T. Asano and H. Wada, First-order phase transition at the Curie temperature in MnAs and MnAs0.9Sb0.1
, J. Phys. Soc. Japan
, vol.75 no.8 (2006) 084604-1-6., 2006.08.
83. K. Yamamoto, K. Horiba, M. Taguchi, M. Matsunami, N. Kamakura, Y. Takata, A. Chainani, K. Mimura, M. Shiga, H. Wada, Y. Senba, H. Ohashi, S. Shin, Temperature dependent X-ray absorption spectroscopy of the valence transition
in EuNi2(Si0.20Ge0.80)2, Physica B, vol. 378-380, p.681-2
, 2006.05.
84. H. Yamaoka, A. Taguchi, A. M. Vlaicu, H. Oohashi, K. Yokoi, D. Horiguchi, T. Tochio, Y. Ito, K. Kawatsura, K. Yamamoto, A. Chainani, S. Shin, M. Shiga, H. Wada , Resonant inelastic X-ray scattering of EuNi2(Si1-xGex)2 and Eu2O3 at Eu L-3
absorption edge
, J. Phys. Soc. Japan , vol.75 no.3, 034702., 2006.03.
85. H. Wada, C. Funaba and T. Asano, Effect of heat treatment on the magnetic phase transition and magnetocaloric properties of Mn1+dAs1-xSbx, Mater. Trans., vol.47 no.3 (2006) pp.486-491., 2006.03.
86. R. Burriel, L. Tocadoa, E. Palaciosa, T. Tohei and H .Wada, Square-shape magnetocaloric effect in Mn3GaC, J. Magn. Magn. Mater., vol. 290-291, (2005) 715-718., 2005.01.
87. H. Wada and T. Asano, Effect of heat treatment on giant magnetocaloric properties of Mn1+δAs1-xSbx, J. Magn. Magn. Mater., 10.1016/j.jmmm.2004.11.642, 290, 703-705, vol. 290-291, (2005) 703-705., 2005.01.
88. H. Wada, K. Tanaka and A. Tajiri, Magnetocaloric effect of Co(S1-xSex)2, J. Magn. Magn. Mater., 10.1016/j.jmmm.2004.11.343, 290, 706-708, vol. 290-291, (2005) 706-708., 2005.01.
89. K. Yamamoto, K. Horiba, M. Taguchi, M. Matsunami, N. Kamakura, A. Chainani, Y. Takata, K. Mimura, M. Shiga, H. Wada, Y. Senba, H. Ohashi, and S. Shin, Temperature-dependent Eu 3d-4f x-ray absorption and resonant photoemission study of the valecen transition in EuNi2(Si0.2Ge0.8)2, Phys. Rev. B, vol. 72, (2005) 161101-1-4, 2005.01.
90. E. Palacios, L. Tocado, R. Burriel and H. Wada, Heat capacity and direct determination of the magnetocaloric effect in MnAs1-xSbx (x=0, 0.1, 0.3, 0.4), Proc. Int. Conf. IIR on Magnetic Refrigeration at Room Temperature,
Montreux, Ed. P. Egolf, (IIR-IIF, Paris, 2005)
, p185-p192., 2005.01.
91. H. Wada, C. Funaba, T. Asano, M. Ilyn and A. M. Tishin, Recent progress of magnetocaloric effect of MnAs1-xSbx, Proc. Int. Conf. IIR on Magnetic Refrigeration at Room Temperature,
Montreux, Ed. P. Egolf, (IIR-IIF, Paris, 2005)
, 37-46, p37-p46., 2005.01.
92. K. Yamamoto, M. Maguchi, N. Kamakura, K. Horiba, Y. Takata, A. Chainani, S. Shin, E. Ikenaga, K. Mimura, M. Shiga, H. Wada, H. Namatame, M. Taniguchi, M. Awaji, A. Takeuchi, Y. Nishino, D. Miwa, T. Ishikawa and K. Kobayashi, Hard X-ray photoemission spectroscopy of temperature-induced valence transition
in EuNi2(Si0.20Ge0.80)2, J. Phys. Soc. Japan, vol.73, No.10, 2616-2619., 2004.10.
93. F. Ishikawa, K. Koyama, K. Watanabe, T. Asano and H. Wada, Structural transformation of MnAs1-xSbx under high magnetic fields, Mater. Trans., vol. 45, No. 2, 311-314., 2004.01.
94. T. Tohei and H. Wada, Change in the character of magnetocaloric effect with Ni substitution in Ho(Co1-xNix)2, J. Magn. Magn. Mater., vol. 280, No. 1, 101-107., 2004.01.
95. H. Wada and Y. Kawaguchi, Transport Properties of Gd1-xYxMn2Ge2, J. Alloys and Compounds., vol. 379, 77-81., 2004.01.
96. H. Wada, H. Yoshioka, T. Goto and K. Koyama, Field-induced magnetic transitions of of exchange competing system GdMn2Ge2, J. Magn. Magn. Mater., vol. 272-276, 591-592., 2004.01.
97. T. Morikawa and H. Wada, Effect of deviation from stoichiometry on magnetic and magnetocaloric properties in MnAs1-xSbx, J. Magn. Magn. Mater., vol. 272-276, Supplement 1, E583-584., 2004.08.
98. T. Tohei, H. Wada, Large magnetocaloric effect of Mn3--xCoxGaC, J. Magn. Magn. Mater., vol. 272-276, Supplement 1, E585-586., 2004.01.
99. F. Ishikawa, K. Koyama, K. Watanabe and H. Wada, X-ray diffraction study of the structural phase transition in MnAs under high magnetic fields, Physica B, vol. 346-347, 408-412., 2004.01.
100. P. A. Rayjada, A. Chainani, K. Kanai, T. Haruna, T. Yokoya, S. Shin, H. Wada, Electronic structure changes across the valence transition in EuNi2(Si0.2Ge0.8)2, Phys. Rev. B, vol. 70, (2004) 235105-1-7., 2004.01.
101. T. Tohei, H. Wada and T. Kanomata, Negative magnetocaloric effect at the antiferromagnetic to ferromagnetic transition of Mn3GaC, J. Appl. Phys., vol. 94, 1800-1802., 2003.08.
102. H. Wada, T. Morikawa, K. Taniguchi, T. Shibata, Y. Yamada and Y. Akishige, Giant magnetocaloric effect of MnAs1-xSbx in the vicinity of first-order
magnetic transition, Physica B, vol. 328, 114-116., 2003.04.
103. A. Mitsuda, T. Goto, N. Takeshita, N. Mori, H. Wada and M. Shiga, Magnetic and Transport properties of EuPt2Si2 under high pressure, Acta Physica Polonica B, vol. 34, No.22 1149-1152., 2003.01.
104. J. Y. Son, T. Mizokawa, A. Fujimori, K. Terao, H. Yamada, H. Wada and M. Shiga, Photoemission study of the Laves-phase compounds YMn2 and Y0.97Sc0.03Mn2, Solid State Commun., vol. 127, 237-241., 2003.01.
105. F. Ishikawa, K. Koyama, K. Watanabe and H. Wada, Field induced structural transformation in MnAs, Jpn. J. Appl. Phys., vol. 42, part2, No. 8A, L918-L920., 2003.01.
106. H. Wada, A. Mitsuda, T. Yoshida, T. Yamamoto and T. Tanaka, Intermediate valence state of La0.9Eu0.1Ni2(Si1-xGex)2 compounds, J. Phys. Soc. Japan, vol.72, No.10, 2604-2607., 2003.01.
107. H. Wada, H. Yoshioka, T. Goto, K. Koyama and K. Watanabe, Novel field-induced magnetic transitions of GdMn2Ge2, J. Phys. Soc. Japan, vol.72, No.12, 3197-3203., 2003.12.
108. H. Wada, H. Yoshioka and T. Goto, Novel magnetic phase transitions and magnetoresistance of GdMn2Ge2, J. Phys.: Condens. Matter, vol. 14, No 41, L687-L693., 2002.12.
109. H.Yoshie, E. Hirachi, H. Honda, W. Takahashi, T. Amako, H. Nagai, H. Wada, M. Shiga and K. Yoshimura, Nuclear magnetic resonance of Ce(Co1-xFex)4B , J. Phys. Soc. Japan, vol. 71, No.9, 2253-2256., 2002.09.
110. 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, No. 13, 137204-1-137204-4., 2002.04.
111. T. Kinoshita, H. Pathirannehelage, N. J. Gunasekara, Y Takata, S. Kimura, M. Okuno, Y. Haruyama, N. Kosugi, K. G. Nath, H. Wada, A. Mitsuda, M. Shiga, T. Okuda, A. Harasawa, H. Ogasawara and A. Kotani, Spectroscopy studies of temperature-induced valence transition of
EuNi2(Si1-xGex)2 around Eu 3d-4f, 4d-4f and Ni 2p-3d excitation regions, J. Phys. Soc. Japan, vol. 71, No. 1, 148-55., 2002.01.
112. A. Mitsuda, T. Goto, K. Yoshimura, W. Zhang, N. Sato, K. Kosuge and H. Wada, Weak ferromagnetism induced by pressure in Yb0.8Y0.2InCu4, J. Phys. Chem. Solids, vol. 63, No. 6-8, 1211-1213., 2002.01.
113. S. Kimura, M. Okuno, H. Iwata, T. Saitoh, T. Okuda, A. Harasawa, T. Kinoshita, A. Mitsuda, H. Wada and M. Shiga, Temperature-induced valence transition of EuNi2(Si0.25Ge0.75)2 studied by Eu 4d-4fresonant photoemission and optical conductivity, J. Phys. Soc. Japan, vol. 71, Suppl. 255-257., 2002.01.
114. H. Wada, K. Taniguchi and Y. Tanabe, Extremely large magnetic entropy change of MnAs1-xSbx near room temperature, Mater. Trans., vol.43, No.1, 73-77., 2002.01.
115. H. Wada and Y. Tanabe, Giant magnetocaloric effect of MnAs1-xSbx, Appl. Phys. Lett., vol. 79, No.20, 3302-3304., 2001.11.
116. H. Wada, Y. Tanabe, M. Shiga, H. Sugawara and H. Sato, Magnetocaloric effects of Laves phase Er(Co1-xNix)2 compounds, J. Alloys and Compounds, vol.316, 245-249, 2001.03.
117. M.Shiga, A.Mitsuda, H.Wada, V.V.Platonov, O.M.Tatsenko, V.D.Selemir and R.Z.Levitin, Field-induced valence transition of EuNi2(Si1-xGex)2 under ultra high fields, Physica B, vol. 294-295, 262-266., 2001.01.
118. 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, 703-707., 2001.02.
119. 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, 167-169., 2001.01.
120. 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, vol.1, (2000) 445-447., 2000.12.
121. H. Mitamura, N. Takeshita, Y. Uwatoko, H. Mori, A. Yamaguchi, T. Tomita, H. Wada, N. Mori, H. Ishimoto and T. Goto, Precise resistivity measurement in PrInAg2down to 50 mK, Physica B, vol. 284-288, (2000) 1341-1342., 2000.10.
122. H. Wada, Y. Tanabe, K. Hagiwara and M. Shiga, Magnetic phase transition and magnetocaloric effect of DyMn2Ge2, J. Magn. Magn. Mater., vol. 218, no. 2-3, (2000) 203-210, 2000.08.
123. 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, (2000) 132-133, 2000.07.
124. E.V. Sampathkumaran, S. Majumdar, R. Mallik, R. Vijayaraghavan, H. Wada and M. Shiga, Unusually large negative magnetoresistance around 200 K in the alloys, Gd1-xLaxMn2Ge2, J. Phys.: Condens. Matter, vol. 12, (2000) L399–L403, 2000.06.
125. A. Mitsuda, H. Wada, M. Shiga and T. Tanaka, Eu valence state and valence transition in Eu(Pd1-xPtx)2Si2, J. Phys.: Condens. Matter, vol. 12, 5287–5296, 2000.06.
126. J. Chaboy, C. Piquer, L. M. Garcia, F. Bartolome, H. Wada, H. Maruyama and N. Kawamura, X-ray absorption spectroscopy study of the instability of ferromagnetism in CeFe2 :
Effects of Co and Al substitutions
, J. Appl. Phys., vol. 87, (2000) 6809-6811., 2000.07.
127. H. Mitamura, N. Takeshita, Y. Uwatoko, H. Mori, A. Yamaguchi, T. Tomita, H. Wada, N. Mori, H. Ishimoto and T. Goto, Magnetoresistance in PrInAg2 at 40 mK, Physica B, vol. 281&282, (2000) 150-151., 2000.07.
128. J. Sakurai, S. Fukuda, A. Mitsuda, H. Wada and M. Shiga, Thermoelectric power of EuNi2(Si1-xGex)2, Physica B, vol. 281&282, (2000) 134-135., 2000.07.
129. A. Mitsuda, H. Wada, M. Shiga, H. Mitamura and T. Goto, Volume magnetostriction of valence fluctuation compounds EuNi2(Si1-xGex)2, Physica B , vol. 281&282, (2000) 130-131., 2000.07.
130. J. Chaboy, C. Piquer, L. M. Garcia, F. Bartolome, H. Wada, H. Maruyama and N. Kawamura, X-ray absorption on Ce(Fe1-xCox)2 and Ce(Fe1-xAlx)2 compounds, Phys. Rev. B, vol. 62, 468-475., 2000.01.
131. H. Wada, S. Tomekawa and M. Shiga, Magnetocaloric properties of a first-order magnetic transition system ErCo2 , Cryogenics, vol. 39, No. 11 (1999) 915-919., 1999.11.
132. A. Yu. Sokolov, Guo Guanghua, S. A. Granovskii, R. Levitin, H. Wada, M. Shiga and T. Goto, Spontaneous and field-induced magnetic phase transitions in the intermetallic compounds
(Gd1-xYx)Mn2Ge2
, Zh. Eksp. Teor. Fiz., vol. 116, (1999) 1346-1364., 1999.11.
133. H. Wada, M. F. Hundley, R. Movshovich, and J. D. Thompson, Pressure effect on the valence transition of EuNi2(Ge1-xSix)2, Phys.Rev. B, vol. 59, (1999) 1141-4. , 1999.01.
134. 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. Japan. , vol. 68, no. 3, (1999) 950-3., 1999.03.
135. H. Wada, S. Tomekawa and M. Shiga, Magnetocaloric effect of ErCo2, J. Magn. Magn. Mater. , vol. 196-197, (1999) 689-90, 1999.05.
136. 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, (1999) 883-884., 1999.05.
137. A. Sokolov, H. Wada, M. Shiga and T. Goto, The effects of competing interactions in Gd1-xYxMn2Ge2, J. Magn. Magn. Mater. , vol. 196-197, (1999) 734-736., 1999.05.
138. 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, (1999) 27-9., 1999.10.

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