Kohei Yamamoto - My portal

Profile Information

Affiliation: 助教, 物質分子科学研究領域, 分子科学研究所

Degree: Master of Science(The University of Tokyo)
Doctor of Science(Mar, 2022, The University of Tokyo)

J-GLOBAL ID: 201901017341071050
researchmap Member ID: B000354911

External link: https://sites.google.com/site/yamakolux/

Research Areas

Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

Papers

Photo-induced antiferromagnetic-ferromagnetic and spin-state transition in a double-perovskite cobalt oxide thin film

Yujun Zhang, Tsukasa Katayama, Akira Chikamatsu, Christian Schüßler-Langeheine, Niko Pontius, Yasuyuki Hirata, Kou Takubo, Kohei Yamagami, Keisuke Ikeda, Kohei Yamamoto …

Communications Physics, 5(1), Dec, 2022
Photoinduced transient states of antiferromagnetic orderings in La1/3Sr2/3FeO3 and SrFeO3-delta thin films observed through time-resolved resonant soft x-ray scattering

Kohei Yamamoto, Tomoyuki Tsuyama, Suguru Ito, Kou Takubo, Iwao Matsuda, Niko Pontius, Christian Schuessler-Langeheine, Makoto Minohara, Hiroshi Kumigashira, Yuichi Yamasaki …

NEW JOURNAL OF PHYSICS, 24(4), Apr, 2022
6-GHz lattice response in a quantum spin-orbital liquid probed by time-resolved resonant x-ray scattering

Kou Takubo, Takashi Mizokawa, Huiyuan Man, Kohei Yamamoto, Yujun Zhang, Yasuyuki Hirata, Hiroki Wadati, Daniel I. Khomskii, Satoru Nakatsuji

Physical Review B, 104(20), Nov 10, 2021
Ultrafast optical stress on BaFe2As2

Takeshi Suzuki, Yuya Kubota, Asuka Nakamura, Takahiro Shimojima, Kou Takubo, Suguru Ito, Kohei Yamamoto, Shoya Michimae, Hikaru Sato, Hidenori Hiramatsu …

Physical Review Research, 3(3), Sep 8, 2021
Spin-orbital liquid in Ba3CuSb2O9 stabilized by oxygen holes

Kou Takubo, Huiyuan Man, Satoru Nakatsuji, Kohei Yamamoto, Yujun Zhang, Yasuyuki Hirata, Hiroki Wadati, Akira Yasui, Takashi Mizokawa, Daniel I. Khomskii

Physical Review Materials, Jul 19, 2021
Soft-X-Ray Vortex Beam Detected by Inline Holography

Yuta Ishii, Kohei Yamamoto, Yuichi Yokoyama, Masaichiro Mizumaki, Hironori Nakao, Taka-hisa Arima, Yuichi Yamasaki

Physical Review Applied, 14(6), Dec 24, 2020
Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film

Shoya Sakamoto, Kenichi Kaminaga, Daichi Oka, Ryu Yukawa, Masafumi Horio, Yuichi Yokoyama, Kohei Yamamoto, Kou Takubo, Yosuke Nonaka, Keisuke Koshiishi …

Physical Review Materials, 4(9), Sep 18, 2020
Interfacial-hybridization-modified Ir ferromagnetism and electronic structure in LaMnO3/SrIrO3 superlattices

Yujun Zhang, Yong Zheng Luo, Liang Wu, Motohiro Suzuki, Qinghua Zhang, Yasuyuki Hirata, Kohei Yamagami, Kou Takubo, Keisuke Ikeda, Kohei Yamamoto …

PHYSICAL REVIEW RESEARCH, 2(3), Sep, 2020
Element-selectively tracking ultrafast demagnetization process in Co/Pt multilayer thin films by the resonant magneto-optical Kerr effect

Kohei Yamamoto, Souliman El Moussaoui, Yasuyuki Hirata, Susumu Yamamoto, Yuya Kubota, Shigeki Owada, Makina Yabashi, Takeshi Seki, Koki Takanashi, Iwao Matsuda …

Applied Physics Letters, 116(17) 172406-172406, Apr 27, 2020 Peer-reviewed
Ultrafast demagnetization of Pt magnetic moment in L10-FePt probed by magnetic circular dichroism at a hard x-ray free electron laser

Kohei Yamamoto, Yuya Kubota, Motohiro Suzuki, Yasuyuki Hirata, Karel Carva, Marco Berritta, Kou Takubo, Yohei Uemura, Ryo Fukaya, Kenta Tanaka …

New Journal of Physics, 21(12) 123010, Dec, 2019 Peer-reviewed
Nature of Carrier Doping in T′-La1.8−xEu0.2SrxCuO4 Studied by X-Ray Photoemission and Absorption Spectroscopy

Chun Lin, Masafumi Horio, Takayuki Kawamata, Shin Saito, Keisuke Koshiishi, Shoya Sakamoto, Yujun Zhang, Kohei Yamamoto, Keisuke Ikeda, Yasuyuki Hirata …

Journal of the Physical Society of Japan, 88(11) 115004, Nov, 2019 Peer-reviewed
Photoinduced valence dynamics in EuNi2(Si0.21Ge0.79)2 studied via time-resolved x-ray absorption spectroscopy

Y. Yokoyama, K. Kawakami, Y. Hirata, K. Takubo, K. Yamamoto, K. Abe, A. Mitsuda, H. Wada, T. Uozumi, S. Yamamoto …

Physical Review B, 100(11) 115123, Sep, 2019 Peer-reviewed
Magnetic and electronic properties of B -site-ordered double-perovskite oxide La2CrMnO6 thin films

K. Yoshimatsu, J. Ishimaru, K. Watarai, K. Yamamoto, Y. Hirata, H. Wadati, Y. Takeda, K. Horiba, H. Kumigashira, O. Sakata …

Physical Review B, 99(23), Jun 13, 2019 Peer-reviewed
Polarization control with an X-ray phase retarder for high-time-resolution pump–probe experiments at SACLA

Y. Kubota, M. Suzuki, T. Katayama, K. Yamamoto, K. Tono, Y. Inubushi, T. Seki, K. Takanashi, H. Wadati, M. Yabashi

Journal of Synchrotron Radiation, 26 1139-1143, Jun, 2019 Peer-reviewed
Study of photoinduced valence dynamics in EuNi$_2$(Si$_{0.21}$Ge$_{0.79}$)$_2$ through time-resolved X-ray absorption spectroscopy

May, 2019 Peer-reviewed
Direct Evidence of Interfacial Hydrogen Bonding in Proton-Electron Concerted 2D Organic Bilayer on Au Substrate

Apr, 2019 Peer-reviewed
Ultrafast demagnetization of Pt magnetic moment in L1${}_0$-FePt probed by hard x-ray free electron laser

Oct, 2018 Peer-reviewed
Electronic Structure of Ce-Doped and -Undoped Nd2CuO4 Superconducting Thin Films Studied by Hard X-Ray Photoemission and Soft X-Ray Absorption Spectroscopy

M. Horio, Y. Krockenberger, K. Yamamoto, Y. Yokoyama, K. Takubo, Y. Hirata, S. Sakamoto, K. Koshiishi, A. Yasui, E. Ikenaga …

Physical Review Letters, 120(25), Jun 21, 2018 Peer-reviewed
Element Selectivity in Second-Harmonic Generation of GaFeO3 by a Soft-X-Ray Free-Electron Laser

Sh. Yamamoto, T. Omi, H. Akai, Y. Kubota, Y. Takahashi, Y. Suzuki, Y. Hirata, K. Yamamoto, R. Yukawa, K. Horiba …

Physical Review Letters, 120(22), Jun 1, 2018 Peer-reviewed
Commensurate versus incommensurate charge ordering near the superconducting dome in Ir1-xPtxTe2 revealed by resonant x-ray scattering

K. Takubo, K. Yamamoto, Y. Hirata, H. Wadati, T. Mizokawa, R. Sutarto, F. He, K. Ishii, Y. Yamasaki, H. Nakao …

Physical Review B, 97(20), May 31, 2018 Peer-reviewed

Misc.

X-Ray Absorption Spectroscopy of 4fCompounds and Future Directions Toward Time-resolved Measurements

和達大樹, 田久保耕, 津山智之, 横山優一, 山本航平, 平田靖透, 伊奈稔哲, 新田清文, 水牧仁一朗, 富樫格 …

X線分析の進歩, (49) 169-175, Mar, 2018
梯子型超伝導体BaFe₂S₃の共鳴軟X線散乱

田久保耕, 横山優一, 山本航平, 平田靖透, 和達大樹, 岩崎駿, 溝川貴司, BOYKO Teak, SUTARTO Ronny, HE Feizoh …

日本放射光学会年会・放射光科学合同シンポジウム(Web), 31st, 2018
Magnetization dynamics of FePt thin films measured by time-resolved x-ray magnetic circular dichroism at Pt L edge

Yamamoto K, Suzuki M, Katayama T, Togashi T, Adachi S, Tamasaku K, Yabashi M, Tanaka Y, Seki T, Takanashi K …

Meeting Abstracts of the Physical Society of Japan, 73 717-717, 2018
高分解能軟X線発光分光で観測したLaCoO₃薄膜のスピン状態とエピタキシャル歪みの関係

横山優一, 横山優一, 平田靖透, 平田靖透, 山本航平, 山本航平, 田久保耕, 宮脇淳, 原田慈久, 朝倉大輔 …

日本放射光学会年会・放射光科学合同シンポジウム(Web), 30th, 2017
共鳴X線散乱でみたLa_1/3Sr_2/3FeO₃の磁気秩序の膜厚依存

山本航平, 山本航平, 平田靖透, 平田靖透, 堀尾眞史, 横山優一, 横山優一, 田久保耕, 簑原誠人, 組頭広志 …

日本放射光学会年会・放射光科学合同シンポジウム予稿集, 29th 63, Jan 9, 2016
放射光軟X線を利用する時間分解X線回折装置の開発

平岡靖透, 平岡靖透, 田久保耕, 横山優一, 横山優一, 山本航平, 山本航平, 山本達, 山本達, 山本真吾 …

日本放射光学会年会・放射光科学合同シンポジウム予稿集, 29th 71, Jan 9, 2016
軟X線発光分光で見たエピタキシャル歪みとLaCoO₃薄膜のスピン状態の関係

横山優一, 横山優一, 平田靖透, 平田靖透, 山本航平, 山本航平, 田久保耕, 朝倉大輔, 山崎裕一, 山崎裕一 …

日本放射光学会年会・放射光科学合同シンポジウム予稿集, 29th 57, Jan 9, 2016
Thickness dependence of charge and magnetic orderings in La_1/3Sr_2/3FeO₃ thin films studied by soft and hard x-ray

Yamamoto K, Hirata Y, Horio M, Yokoyama Y, Takubo K, Minohara M, Kumigashira H, Yamasaki Y, Nakao H, Murakami Y …

Meeting Abstracts of the Physical Society of Japan, 71 2288-2288, 2016
19aCD-2 Resonant soft X-ray diffraction study of the thickness-dependent magnetic ordering in La_<1/3>Sr_<2/3>FeO_3 thin films

Yamamoto K, Hirata Y, Horio M, Yokoyama Y, Takubo K, Minohara M, Kumigashira H, Yamamsaki Y, Nakao H, Murakami Y …

Meeting Abstracts of the Physical Society of Japan, 70, 2015