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Akihiro Mitsuda Last modified date:2021.10.22

Associate Professor / Condensed Matter Physics
Department of Physics
Faculty of Sciences

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Research Interests
  • Pressure effects on nano spin device
    keyword : pure spin current, GMR, Pressure effect
  • Study on valence fluctuating rare-earth compounds and alloys
    keyword : Europium, Ytterbium, Valence fluctuation, Charge order, pressure
Academic Activities
1. Akihiro MITSUDA, What is Origin of the First Eu-Based Heavy Fermion?, Journal of Physical Society of Japan News and Comments, 2013.08, [URL].
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, 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..
2. 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, 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..
3. 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, 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..
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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.
15. 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.
16. 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.
1. Akihiro MITSUDA, Masaki Sugishima, Takumi Hasegawa, Satoshi Tsutsui, A. Q. R. Baron, Masayuki Udagawa, Hirofumi Wada, Inelastic x-ray scattering of valence fluctuating YbPd, The International Conferenece on Strongly Correlated Electron Systems 2013, 2013.08.