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Hello! I am a Research associate in Kohama group at ISSP, University of Tokyo. My research aims to search for novel field-induced phases and cross-correlation responses in frustrated magnets and helimagnets by making full use of advanced physical property measurements under extreme conditions such as low temperature, high magnetic field, and uniaxial stress.

News

  1. 2023.10.01: A paper titled “Spin-Lattice-Coupled Helical Magnetic Order in Breathing Pyrochlore Magnets, CuAlCr4S8 and CuGaCr4S8” was published in Journal of the Physical Society of Japan.
    [J. Phys. Soc. Jpn. 93, 104602 (2024).]

  2. 2024.09.18: I made an oral presentation at the JPS meeting. The topic was our recent study on the magnetic structure of EuIn2As2.

  3. 2024.09.06: A preprint titled “Crystal-field magnetostriction of the spin ice under ultrahigh magnetic fields” is now available online.
    [arXiv:2409.03673]

  4. 2024.08.08: A paper titled “Metamagnetism and anomalous magnetotransport properties in rare-earth-based polar semimetals RAuGe (R = Dy, Ho, and Gd)” was published in Physical Review B.
    [Phys. Rev. B 110, 064409 (2024).]

  5. 2024.07.19: High magnetic-field team A won the group championship in the ISSP bowling tournament!

  6. 2024.07.16: A paper titled “Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets” was published in Physical Review B.
    [Phys. Rev. B 110, L041116 (2024).]

  7. 2024.07.08: I attended the international conference RHMF2024 held at Nijmegen (Netherlands) and made a oral presentation about the breathing pyrochlore magnets.

  8. 2024.07.01: I joined Kohama Group at the Institute for Solid State Physics, University of Tokyo, as a research associate.

  9. 2024.06.21: A paper titled “Negative charge-transfer energy SrFeO3 revisited with hard x-ray photoemission spectroscopy” was published in Physical Review B.
    [Phys. Rev. B 109, 235138 (2024).]

  10. 2024.05.09: A preprint titled “Spin-lattice-coupled helical magnetic order in breathing pyrochlore magnets, CuAlCr4S8 and CuGaCr4S8” is now available online.
    [arXiv:2405.05108]

  11. 2024.04.21: I made one oral and one poster presentations at the 3rd Area meeting of “1000 Tesla Science”. I received the Best Poster Award.

  12. 2024.03.19: I made three oral presentations at the JPS meeting.

  13. 2024.03.12: A paper titled “Cluster rearrangement by chiral charge order in lacunar spinel GaNb4Se8” was published in Chemistry of Materials.
    [Chem. Mater. 36, 2993 (2024).]

  14. 2024.03.06: A preprint titled “Incommensurate broken-helix and broken-fanlike states in axion insulator candidate EuIn2As2” is now available online.
    [arXiv:2403.03022]

  15. 2024.02.29: I received JSPS KAKENHI the Academic Transformation Area Research (A) “1000 Tesla Science” for next two years!

  16. 2024.02.21: I made a poster presentation at the international meeting CEMS sympsium held in Akihabara.

  17. 2023.11.13: A preprint titled “Rhenium oxyhalides: a showcase for anisotropic-triangular-lattice quantum antiferromagnets” is now available online.
    [arXiv:2311.06040]

  18. 2023.10.17: A paper titled “Breathing pyrochlore magnet CuGaCr4S8: Magnetic, thermodynamic, and dielectric properties” was published in Physical Review Materials.
    [Phys. Rev. Mater. 7, 104404 (2023).]

  19. 2023.09.19: I attended the JPS meeting held at Tohoku University. Although I did not give my own talk, I enjoyed many exciting presentations.

  20. 2023.08.19: A paper titled “Real-space observation of ligand hole state in cubic perovskite SrFeO3” was published in Advanced Science.
    [Adv. Sci. 2302839 (2023).]

  21. 2023.08.08: A paper titled “Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet” was published in Proc. Natl. Acad. Sci. U.S.A. This work was also featured in ISSP News！
    [Proc. Natl. Acad. Sci. U.S.A. 120, e2302756120 (2023).]

  22. 2023.03.23: I made two oral presentations at the JPS meeting. The topics were "Simultaneous observation of orthorhombic distortion and magnetic modulation in a skyrmion-hosting compound EuAl4 by a resonant X-ray scattering experiment" and "Structural and magnetic properties of a novel breathing pyrochlore magnet CuGaCr4S8".

  23. 2023.03.21: A preprint titled “Breathing pyrochlore magnet CuGaCr4S8: Magnetic, thermodynamic, and dielectric properties” is now available online.
    [arXiv:2303.10671]

  24. 2023.03.10: A paper titled “Double dome structure of the Bose–Einstein Condensation in Diluted S = 3/2 Quantum Magnets” was published in Nature Communications.
    [Nat. Commun. 14, 1260 (2023).]

  25. 2023.03.09: A paper titled “Single crystal growths and magnetic properties of hexagonal polar semimetals RAuGe (R = Y, Gd−Tm, and Lu)” was published in Journal of Alloys and Compounds.
    [J. Alloys Compd. 947, 169475 (2023).]

  26. 2023.02.28: I received JSPS KAKENHI Grant-in-Aid for Young Scientists for next two years!

  27. 2023.01.26: A paper titled “Rhombic skyrmion lattice coupled with orthorhombic structural distortion in EuAl4” was published in Physical Review B.
    [Phys. Rev. B 107, L020410 (2023).]

  28. 2023.01.24: A preprint titled “Spin-lattice-coupled superstructure induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet” is now available online.
    [arXiv:2301.09509]

  29. 2022.12.09: A paper titled “Magnetic-Field Induced Antiferromagnetic-Antiferromagnetic Phase Transition in Quasi-Two-Dimensional Multiferroic Material Ba2FeSi2O7” was published in Journal of the Physical Society of Japan.
    [J. Phys. Soc. Jpn. 92, 014701 (2023).]
    (This work was introduced in JPS Hot Topics!)

  30. 2022.12.06: I made an invited talk in Symposium "Synthesis, characterization, and functions of intriguing transition metal compounds" at 32nd Annual Meeting of MRS-Japan 2022 (@Yokohama).

  31. 2022.11.24: I made an invited talk at the high-field meeting.
    (2022.11.28 PS: I received the Best Presentation Award for Young Scientists for this presentation！)

  32. 2022.10.24: A paper titled “Dimensional reduction and incommensurate dynamic correlations in the S = 1/2 triangular-lattice antiferromagnet Ca3ReO5Cl2” was published in Nature Communications.
    [Nat. Commun. 13, 6310 (2022).]

  33. 2022.10.21: I went to SACLA and performed the pulse high magnetic field X-ray diffraction experiment organized by Ikeda-san in UEC univ from Oct. 18th to 21st. This technique is under development, so that many trial and error were required during the beamtime. Please also take a look at Ikeda-san's blog for a brief report.

  34. 2022.09.27: A preprint titled “Rhombic skyrmion lattice coupled with orthorhombic structural distortion in EuAl4” is now available online.
    [arXiv:2209.12751]

  35. 2022.09.23: A paper titled “Anisotropic magnetotransport properties coupled with spiral spin modulation in a magnetic semimetal EuZnGe” was published in Physical Review Materials.
    [Phys. Rev. Mater. 6, 094410 (2022).]

  36. 2022.09.14: I made an oral presentation at the JPS meeting. The topic was our recent dilatometry study on a skyrmion-hosting square-lattice itinerant magnet EuAl4. I enjoyed the first onsite conference in a long time.

  37. 2022.08.26: A paper titled “Complex magnetic phase diagram with a small phase pocket in a three-dimensional frustrated magnet CuInCr4S8” was published in Physical Review Research.
    [Phys. Rev. Research 4, 033148 (2022).]

  38. 2022.08.24: I made a poster presentation at the international meeting LT29 (29th International Conference on Low Temperature Physics) held in Sapporo and online from Aug. 18st to 24st.

  39. 2022.08.03: I have finished my last business trip before the Bon vacation. Since the beginning of April, I have visited SPring-8 twice, Photon Factory twice, and JRR-3 once, and having enjoyed quantum beam science to the fullest. I would like to further improve my skills in crystal structure analysis.

  40. 2022.06.09: A paper titled “Enhancement of giant magnetoelectric effect in Ni-doped CaBaCo4O7” was published in Physical Review B. This paper was selected as PRB Editors' Suggestion.
    [Phys. Rev. B 105, 214412 (2022).]

  41. 2022.05.26: The home page has been renewed. I would like to enrich the contents little by little.

  42. 2022.05.21: A paper titled “Nematicity and fractional magnetization plateaus induced by spin-lattice coupling in the classical kagome-lattice Heisenberg antiferromagnet” was published in Physical Review B.
    [Phys. Rev. B 105, 174424 (2022).]

  43. 2022.05.17: A paper titled “Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe2” was published in Journal of the Physical Society of Japan.
    [J. Phys. Soc. Jpn. 91, 063703 (2022).]
    (2022.05.27 PS: This paper was selected as JPSJ Editors' Choice!)

  44. 2022.05.09: A paper titled “Quantum phase of the chromium spinel oxide HgCr2O4 in high magnetic fields” was published in Physical Review B.
    [Phys. Rev. B 105, L180405 (2022).]

  45. 2022.04.01: I moved to RIKEN Center for Emergent Matter Science (CEMS) and join Strong-correlation Quantum Science Research Team as Special Postdoctoral Researcher.

  46. 2022.03.31: A paper titled “Enhancement of giant magnetoelectric effect in Ni-doped CaBaCo4O7” was submitted.
    [arXiv:2203.16397]

  47. 2022.02.21: A paper titled “Nematicity and fractional magnetization plateaus induced by spin-lattice coupling in the classical kagome-lattice Heisenberg antiferromagnet” was submitted.
    [arXiv:2202.09077]

  48. 2022.01.13: I visited Osaka university from Jan. 11st to 13rd to perform high-presure synthesis at Ishiwata Lab. It was very exciting for me, and fortunately the synthesis was also successful.

  49. 2021.12.22: I made a poster presentation at the international meeting ICFTS (The International Conference on Frustration, Topology and Spin Textures). The topic was the magnetic phase diagram of CuInCr4S8.

  50. 2021.12.21: A paper titled “Physical properties of liquid oxygen under ultrahigh magnetic fields” was published in Physical Review B.
    [Phys. Rev. B 104, 224423 (2021).]

  51. 2021.12.17: A paper titled “Complex magnetic phase diagram with a small phase pocket in a three-dimensional frustrated magnet CuInCr4S8” was submitted.
    [arXiv:2112.08990]

  52. 2021.11.19: A paper titled “Phase transition in the 5d1 double perovskite Ba2CaReO6 induced by high magnetic field” was published in Physical Review B.
    [Phys. Rev. B 104, 174422 (2021).]

  53. 2021.11.09: A paper titled “Effects of spin-lattice coupling and a magnetic field in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice” was published in Physical Review B.
    [Phys. Rev. B 104, 085206 (2021).]

  54. 2021.09.20: I made two oral presentations at the JPS meeting. The topic was the discovery of novel field-induced magnetic phases on the breathing pyrochlore lattice magnets, LiGaCr4O8 and CuInCr4S8.

  55. 2021.08.24: A paper titled “Heavy carrier effective masses in van der Waals semiconductor Sn(SeS) revealed by high magnetic fields up to 150 T” was published in Physical Review B.
    [Phys. Rev. B 104, 085206 (2021).]

  56. 2021.04.01: I moved to Arima-Tokunaga Lab., Department of Advanced Materials Science, University of Tokyo. I will work as a JSPS postdoctoral.

  57. 2021.03.13: I made an oral presentation at the JPS meeting (Area 3). The topic was quantum antiferromagnets on the anisotropic triangular lattice A3ReO5X2.

  58. 2021.03.08: A paper titled “Higher magnetic-field generation by a mass-loaded single-turn coil” was published in Review of Scientific Instruments.
    [Rev. Sci. Instrum. 92, 033902 (2021).]

  59. 2021.02.22: I joined FBG strain gauge meet up (online) and made a short presentation.

  60. 2021.01.28: I passed the PhD defence.

  61. 2021.01.21: I gave a talk at the 8th online high-field seminar. The topic was “Sucsessive phase transitions on the breathing pyrochlore magmets in high magnetic fields”.

  62. 2020.10.28: A paper titled “Broad tunability of carrier effective masses in two-dimensional halide perovskites” was published in ACS Energy Letter.
    [ACS Energy Lett. 5, 3609 (2020).]

  63. 2020.09.11: I made a poster presentation at the JPS meeting (Area 5). The topic was the Paschen-Back effect on ruby in ultrahigh magnetic fields. (2020.09.25 PS: I received the Best Student Presentation Award for this presentation！)

  64. 2020.08.18: A paper titled “Crystal-field Paschen-Back effect on ruby in ultrahigh magnetic fields” was published in the open access journal Physical Review Research.
    [Phys. Rev. Research 2, 033257 (2020).]

  65. 2020.03.21: I visited Germany from Mar. 5th to 21st to perform ESR measurement at Dresden High Magnetic Field Laboratory (HZDR). It was my first experience to do experiment in a static magnetic field.

  66. 2020.02.25: A paper titled “Magnetization process of the breathing pyrochlore magnet CuInCr4S8 in ultrahigh magnetic fields up to 150 T” was published in Physical Review B.
    [Phys. Rev. B 101, 054434 (2020).]

  67. 2020.02.21: The science camp was held in Kohama laboratory from Feb. 18th to 21st. We performed high-field experiments with undergraduate students.

  68. 2019.12.05: I made two presentations (1 oral, 1 poster) at the high-field meeting held at Osaka university.

  69. 2019.10.31: A paper titled “Magnetocaloric effect and spin-strain coupling in the spin-nematic state of LiCuVO4” was published in the open access journal Physical Review Research.
    [Phys. Rev. Research 1, 033065 (2019).]

  70. 2019.10.16: This website is opened.