Masaki Gen/厳正輝

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Original paper

Submitted, Preprint

Uniaxial stress control of versatile helimagnetic phases in the square-lattice itinerant magnet EuAl₄
M. Gen^*, T. Nomoto, H. Saito, T. Nakajima, Y. Tokunaga, R. Takagi, S. Seki, and T. Arima
arXiv:2511.07079

Unified description of spin-lattice coupling: application to thermodynamic properties of the pyrochlore Heisenberg antiferromagnet
M. Gen^*, H. Suwa^*, S. Imajo, C. Dong, H. Ueda, M. Tachibana, A. Ikeda, K. Kindo, and Y. Kohama
arXiv:2508.13535

Published, Accepted (First-author: 16, Co-author: 24)

Quintuplet condensation in the skyrmionic insulator Cu₂OSeO₃ at ultrahigh magnetic fields
T. Nomura^*, I. Rousochatzakis^*, O. Janson^*, M. Gen, X.-G. Zhou, Y. Ishii, S. Seki, Y. Kohama, and Y. H. Matsuda
Phys. Rev. Lett. in press. [arXiv:2509.12802]

Perfectly harmonic spin cycloid and multi-Q textures in the Weyl semimetal GdAlSi
R. Nakano, R. Yamada^*, J. Bouaziz^*, M. Colling, M. Gen, K. Shoriki, Y. Okamura, A. Kikkawa, R. Misawa, P. Baral, S. Kitou, Y. Nakamura, H. Ohsumi, Y. Tanaka, H. Sagayama, H. Nakao, Y. Ishihara, K. Gautam, O. Fabelo, Y. Taguchi, Y. Takahashi, M. Tokunaga, T. Arima, Y. Tokura, R. Arita, J. Masell, S. Hayami, and M. Hirschberger^*
Nat. Commun. in press. [arXiv:2503.14768]

Chemically tunable quantum magnetism on the anisotropic triangular lattice in rhenium oxyhalides
M. Gen^*, D. Hirai, K. Morita, K. Nawa, S. Kogane, N. Matsuyama, T. Yajima, M. Kawamura, K. Deguchi, A. Koda, M. Kofu, S. Ohira-Kawamura, T. J. Sato, A. Matsuo, K. Kindo, Y. Kohama, and Z. Hiroi
Nat. Commun. 16, 9938 (2025). [arXiv:2311.06040]
Press release

X-Ray Free-Electron Laser Observation of Giant and Anisotropic Magnetostriction in β-O₂ at 110 Tesla
A. Ikeda^*, Y. Kubota^*, Y. Ishii, X.-G. Zhou, S. Peng, H. Hayashi, Y. H. Matsuda, K. Noda, T. Tanaka, K. Shimbori, K. Seki, H. Kobayashi, D. Bhoi, M. Gen, K. Gautam, M. Akaki, S. Kawachi, S. Kasamatsu, T. Nomura, Y. Inubushi, and M. Yabashi
Phys. Rev. Lett. 135, 186702 (2025). [arXiv:2504.10085]
(PRL Editors' Suggestion, On the Cover)
Press release

X-ray diffraction study of the magnetization plateau above 40 T in the frustrated helimagnet CuGaCr₄S₈
M. Gen^*, K. Noda, K. Shimbori, T. Tanaka, D. Bhoi, K. Seki, H. Kobayashi, K. Gautam, M. Akaki, Y. Ishii, Y. H. Matsuda, Y. Kubota, Y. Inubushi, M. Yabashi, Y. Kohama, T. Arima, and A. Ikeda
Phys. Rev. B 111, 214441 (2025). [arXiv:2504.10840]
(PRB Editors' Suggestion)

Electronic structure of the Kramers nodal-line semimetal YAuGe
T. Kurumaji^*, J. I. Facio, N. Mitsuishi, S. Imajo, M. Gen, M. Kimata, L. Ye, D. Graf, M. Sakano, M. Kitamura, K. Yamagami, K. Ishizaka, K. Kindo, T. Arima
Adv. Sci. 12, 2501669 (2025). [arXiv:2501.08973]

Magnetization process of a quasi-two-dimensional quantum magnet: Two-step symmetry restoration and dimensional reduction
A. Reinold, L. Berger, M. Raczkowski^*, Z. Zhao^*, Y. Kohama, M. Gen, D. I. Gorbunov, Y. Skourski, S. Zherlitsyn, F. F. Assaad, T. Lorenz^*, and Z. Wang^*
Phys. Rev. B 111, L100405 (2025). [arXiv:2411.09541]

Canted antiferromagnetism in a spin-orbit coupled S_eff = 3/2 triangular-lattice magnet DyAuGe
T. Kurumaji, M. Gen, S. Kitou, K. Ikeuchi, H. Sagayama, H. Nakao, T. R. Yokoo, and T. Arima
Nat. Commun. 16, 2176 (2025). [arXiv:2401.16622]

Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn₂As₂
M. Gen^*, Y. Fujishiro, K. Okigami, S. Hayami, M. T. Birch, K. Adachi, D. Hashizume, T. Kurumaji, H. Sagayama, H. Nakao, Y. Tokura, and T. Arima
Phys. Rev. B 111, L081109 (2025). [arXiv:2403.03022]

Triangular Lattice Magnet GdGa₂ with Short-Period Spin Cycloids and Possible Skyrmion Phases
P. R. Baral, N. D. Khanh, M. Gen, H. Sagayama, H. Nakao, T. Arima, Y. Ōnuki, Y. Tokura, and M. Hirschberger
J. Phys. Soc. Jpn. 94, 024705 (2025). [arXiv:2503.18457]
(JPSJ Editors' Choice)
JPSJ News Comments 22, 01 (2025)., JPS Hot Topics

Crystal-field magnetostriction of the spin ice under ultrahigh magnetic fields
N. Tang^*, M. Gen^*, M. Rotter, H. Man, K. Matsuhira, A. Matsuo, K. Kindo, A. Ikeda, Y. H. Matsuda, P. Gegenwart, S. Nakatsuji, and Y. Kohama (Co-first)
Phys. Rev. B 110, 214414 (2024). [arXiv:2409.03673]

Spin-Lattice-Coupled Helical Magnetic Order in Breathing Pyrochlore Magnets, CuAlCr₄S₈ and CuGaCr₄S₈
M. Gen^*, T. Nakajima, H. Saito, Y. Tokunaga, and T. Arima
J. Phys. Soc. Jpn. 93, 104602 (2024). [arXiv:2405.05108]

Metamagnetism and anomalous magnetotransport properties in rare-earth-based polar semimetals RAuGe (R = Dy, Ho, and Gd)
T. Kurumaji, M. Gen, S. Kitou, and T. Arima
Phys. Rev. B 110, 064409 (2024). [arXiv:2405.00628]

Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets
M. Ueno, T. Kurumaji, S. Kitou, M. Gen, Y. Nakamura, Y. Tokunaga, and T. Arima
Phys. Rev. B 110, L041116 (2024). [arXiv:2407.00963]

Negative charge-transfer energy SrFeO₃ revisited with hard x-ray photoemission spectroscopy
D. Takegami, M. Nakamura, A. Melendez-Sans, K. Fujinuma, R. Nakamura, M. Yoshimura, K.-D. Tsuei, A. Tanaka, M. Gen, Y. Tokunaga, S. Ishiwata, and T. Mizokawa
Phys. Rev. B 109, 235138 (2024).

Cluster rearrangement by chiral charge order in lacunar spinel GaNb₄Se₈
S. Kitou^*, M. Gen, Y. Nakamura, Y. Tokunaga, and T. Arima
Chem. Mater. 36, 2993 (2024). [arXiv:2401.03803]
Press release

Breathing pyrochlore magnet CuGaCr₄S₈: Magnetic, thermodynamic, and dielectric properties
M. Gen^*, H. Ishikawa, A. Miyake, T. Yajima, H. O. Jeschke, H. Sagayama, A. Ikeda, Y. H. Matsuda, K. Kindo, M. Tokunaga, Y. Kohama, T. Kurumaji, Y. Tokunaga, and T. Arima
Phys. Rev. Mater. 7, 104404 (2023). [arXiv:2303.10671]

Real-space observation of ligand hole state in cubic perovskite SrFeO₃
S. Kitou^*, M. Gen, Y. Nakamura, K. Sugimoto, Y. Tokunaga, S. Ishiwata, and T. Arima
Adv. Sci. 10, 2302839 (2023). [arXiv:2303.02571]
Press release

Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet
M. Gen^*, A. Ikeda, K. Aoyama, H. O. Jeschke, Y. Ishii, H. Ishikawa, T. Yajima, Y. Okamoto, X.-G. Zhou, D. Nakamura, S. Takeyama, K. Kindo, Y. H. Matsuda, and Y. Kohama^*
Proc. Natl. Acad. Sci. U.S.A. 120, e2302756120 (2023). [arXiv:2301.09509]
ISSP News

Double dome structure of the Bose–Einstein Condensation in Diluted S = 3/2 Quantum Magnets
Y. Watanabe^*, A. Miyake, M. Gen, Y. Mizukami, K. Hashimoto, T. Shibauchi, A. Ikeda, M. Tokunaga, T. Kurumaji, Y. Tokunaga, and T. Arima^*
Nat. Commun. 14, 1260 (2023).
Press release

Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd−Tm, and Lu)
T. Kurumaji^*, M. Gen, S. Kitou, K. Ikeuchi, M. Nakamura, A. Ikeda, and T. Arima
J. Alloys Compd. 947, 169475 (2023). [arXiv:2301.02794]

Rhombic skyrmion lattice coupled with orthorhombic structural distortion in EuAl₄
M. Gen^*, R. Takagi, Y. Watanabe, S. Kitou, H. Sagayama, N. Matsuyama, Y. Kohama, A. Ikeda, Y. Ōnuki, T. Kurumaji, T. Arima, and S. Seki
Phys. Rev. B 107, L020410 (2023). [arXiv:2209.12751]

Magnetic-Field Induced Antiferromagnetic-Antiferromagnetic Phase Transition in Quasi-Two-Dimensional Multiferroic Material Ba₂FeSi₂O₇
Y. Watanabe, M. Gen, T. Kurumaji, Y. Tokunaga, and T. Arima
J. Phys. Soc. Jpn. 92, 014701 (2023).
JPS Hot Topics

Dimensional reduction and incommensurate dynamic correlations in the S = 1/2 triangular-lattice antiferromagnet Ca₃ReO₅Cl₂
S. A. Zvyagin^*, A. N. Ponomaryov, J. Wosnitza, D. Hirai, Z. Hiroi, M. Gen, Y. Kohama, A. Matsuo, Y. H. Matsuda, and K. Kindo
Nat. Commun. 13, 6310 (2022). [arXiv:2210.14864]

Anisotropic magnetotransport properties coupled with spiral spin modulation in a magnetic semimetal EuZnGe
T. Kurumaji, M. Gen, S. Kitou, H. Sagayama, A. Ikeda, and T. Arima
Phys. Rev. Mater. 6, 094410 (2022). [arXiv:2208.02385]

Complex magnetic phase diagram with a small phase pocket in a three-dimensional frustrated magnet CuInCr₄S₈
M. Gen^*, H. Ishikawa, A. Ikeda, A. Miyake, Z. Yang, Y. Okamoto, M. Mori, K. Takenaka, H. Sagayama, T. Kurumaji, Y. Tokunaga, T. Arima, M. Tokunaga, K. Kindo, Y. H. Matsuda, and Y. Kohama
Phys. Rev. Research 4, 033148 (2022). [arXiv:2112.08990]

Enhancement of giant magnetoelectric effect in Ni-doped CaBaCo₄O₇
M. Gen^*, A. Miyake, H. Yagiuchi, Y. Watanabe, A. Ikeda, Y. H. Matsuda, M. Tokunaga, T. Arima^*, and Y. Tokunaga
Phys. Rev. B 105, 214412 (2022). [arXiv:2203.16397]
(PRB Editors' Suggestion)

Nematicity and fractional magnetization plateaus induced by spin-lattice coupling in the classical kagome-lattice Heisenberg antiferromagnet
M. Gen and H. Suwa^*
Phys. Rev. B 105, 174424 (2022). [arXiv:2202.09077]

Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe₂
A. Miyake^*, M. Gen, A. Ikeda, K. Miyake, Y. Shimizu, Y. J. Sato, D. Li, A. Nakamura, Y. Homma, F. Honda, J. Flouquet, M. Tokunaga, and D. Aoki
J. Phys. Soc. Jpn. 91, 063703 (2022). [arXiv:2204.12118]
(JPSJ Editors' Choice)
ISSP News, JPSJ News Comments 19, 10 (2022)., JPS Hot Topics

Quantum phase of the chromium spinel oxide HgCr₂O₄ in high magnetic fields
S. Kimura, S. Imajo, M. Gen, T. Momoi, M. Hagiwara, H. Ueda, and Y. Kohama
Phys. Rev. B 105, L180405 (2022). [arXiv:2205.00810]

Physical properties of liquid oxygen under ultrahigh magnetic fields
T. Nomura^*, A. Ikeda, M. Gen, A. Matsuo, K. Kindo, Y. Kohama, Y. H. Matsuda, S. Zherlitsyn, J. Wosnitza, H. Tsuda, and T. C. Kobayashi
Phys. Rev. B 104, 224423 (2021). [arXiv:2109.05189]

Phase transition in the 5d¹ double perovskite Ba₂CaReO₆ induced by high magnetic field
H. Ishikawa^*, D. Hirai, A. Ikeda, M. Gen, T. Yajima, A. Matsuo, Y. H. Matsuda, Z. Hiroi, and K. Kindo
Phys. Rev. B 104, 174422 (2021). [arXiv:2111.03807]

Effects of spin-lattice coupling and a magnetic field in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice
K. Aoyama^*, M. Gen, and H. Kawamura
Phys. Rev. B 104, 184411 (2021). [arXiv:2108.06961]

Heavy carrier effective masses in van der Waals semiconductor Sn(SeS) revealed by high magnetic fields up to 150 T
Z. Yang^*, Xu. Wang, J. Felton, Z. Kudrynskyi, M. Gen, T. Nomura, Xi. Wang, L. Eaves, Z. D. Kovalyuk, Y. Kohama, L. Zhang^*, and A. Patanè^*
Phys. Rev. B 104, 085206 (2021).

Higher magnetic-field generation by a mass-loaded single-turn coil
M. Gen^*, A. Ikeda, S. Kawachi, T. Shitaokoshi, Y. H. Matsuda, Y. Kohama, and T. Nomura
Rev. Sci. Instrum. 92, 033902 (2021). [arXiv:2102.10254]

Broad tunability of carrier effective masses in two-dimensional halide perovskites
M. Dyksik, H. Duim, X. Zhu, Z. Yang, M. Gen, Y. Kohama, S. Adjokatse, D. Maude, M. A. Loi^*, D. Egger^*, M. Baranowski^*, and P. Plochocka^*
ACS Energy Lett. 5, 3609 (2020).

Crystal-field Paschen-Back effect on ruby in ultrahigh magnetic fields
M. Gen^*, T. Kanda, T. Shitaokoshi, Y. Kohama, and T. Nomura^*
Phys. Rev. Research 2, 033257 (2020). [arXiv:2006.06199]

Magnetization process of the breathing pyrochlore magnet CuInCr₄S₈ in ultrahigh magnetic fields up to 150 T
M. Gen^*, Y. Okamoto, M. Mori, K. Takenaka, and Y. Kohama^*
Phys. Rev. B 101, 054434 (2020). [arXiv:1910.01315]

Magnetocaloric effect and spin-strain coupling in the spin-nematic state of LiCuVO₄
M. Gen, T. Nomura, D. I. Gorbunov, S. Yasin, P. T. Cong, C. Dong, Y. Kohama, E. L. Green, J. M. Law, M. S. Henriques, J. Wosnitza, A. A. Zvyagin, V. O. Cheranovskii, R. K. Kremer, and S. Zherlitsyn^*
Phys. Rev. Research 1, 033065 (2019).

Ultra-high magnetic field magnetic phases up to 130 T in a breathing pyrochlore antiferromagnet LiInCr₄O₈
M. Gen, D. Nakamura, Y. Okamoto, and S. Takeyama^*
J. Magn. Magn. Mater. 473, 387 (2019).

Proceedings

Submitted, Preprint

None

Published, Accepted

Magnetocaloric eﬀect measurements in ultrahigh magnetic fields up to 120 T
R. Ogawa, M. Gen^*, K. Matsuhira, and Y. Kohama^*
1000 T Workshop Proceedings, in press. [arXiv:2512.04509]

Ultrasound experiment on the cubic phase of BaTiO₃ up to 100 T
T. Nomura^*, P. Chiu, M. Gen, Y. Ishii, and Y. H. Matsuda
1000 T Workshop Proceedings, in press.