2012S2-005
外場下共鳴軟X線散乱による構造物性研究

Last modified 2021-05-19 by s-proposalpfiqst.kek.jp

●基本情報
　●実験責任者：中尾　裕則（KEK-PF）
　●課題有効期間：2012/10〜2015/9
　●実験ステーション：4C, 8A, 11B, 13A, 16A, 3A
　●関連課題：2009S2-008（共鳴軟・硬X線散乱を相補的に用いた構造物性研究）

●課題の概要
　強相関電子系では、電子の持つ自由度である電荷・スピン・軌道の結晶格子上での多様な振る舞いから、多彩でかつ新奇な物性が発現しており、電子自由度の秩序状態の研究が物性発現機構の解明の糸口と言える。さらに注目すべき伝導特性や分極発現には、遷移金属や希土類金属イオンとイオン周りに配位する酸素などとの軌道混成状態が重要な役割を担っている。加えて、強相関電子系では外場に対して敏感に応答する物性が特徴的であり、外場応答の研究が極めて重要である。そこで本S2課題では、最近 開発・発展させてきた軟X線領域での共鳴X線散乱手法を用い、強相関電子系の物性発現に関わる電子の電荷・スピン、軌道の秩序状態、配位したイオンの電子状態、さらにそれらの外場応答の解明を目指すものである。

●成果発表
　●論文

• "Importance of 𝑑𝑥𝑦 orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system"
  Tsuyoshi Kawashima, Shigeki Miyasaka, Hirokazu Tsuji, Takahiro Yamamoto, Masahiro Uekubo, Akira Takemori, Kwing To Lai & Setsuko Tajima
  Sci. Rep., 11 (2021) 10006.
• "Isotropic parallel antiferromagnetism in the magnetic field induced charge-ordered state of SmRu₄P₁₂ caused by p−f hybridization"
  T. Matsumura, S. Michimura, T. Inami, C. H. Lee, M. Matsuda, H. Nakao, M. Mizumaki, N. Kawamura, M. Tsukagoshi, S. Tsutsui, H. Sugawara, K. Fushiya, T. D. Matsuda, R. Higashinaka, and Y. Aoki
  Phys. Rev. B, 101 (2020) 214444.
• "Topological metastability supported by thermal fluctuation upon formation of chiral soliton lattice in CrNb₃S₆"
  T. Honda, Y. Yamasaki, H. Nakao, Y. Murakami, T. Ogura, Y. Kousaka & J. Akimitsu
  Sci. Rep., 10 (2020) 18596.
• "Field-induced spin reorientation in the antiferromagnetic Dirac material EuMnBi₂ revealed by neutron and resonant x-ray diffraction"
  H. Masuda, H. Sakai, H. Takahashi, Y. Yamasaki, A. Nakao, T. Moyoshi, H. Nakao, Y. Murakami, T. Arima, and S. Ishiwata
  Phys. Rev. B, 101 (2020) 174411.
• "Current-induced Giant Lattice Deformation in the Mott Insulator Ca₂RuO₄"
  Ryuji Okazaki, Kensuke Kobayashi, Reiji Kumai, Hironori Nakao, Youichi Murakami, Fumihiko Nakamura, Hiroki Taniguchi, and Ichiro Terasaki
  J. Phys. Soc. Jpn., 89 (2020) 044710.
• "Magnetically induced electric polarization in Ba₃Fe₂O₅Cl₂ with tunable direction in three dimensions"
  N. Abe, S. Shiozawa, K. Matsuura, H. Sagayama, A. Nakao, T. Ohhara, Y. Tokunaga, and T. Arima
  Phys. Rev. B, 101 (2020) 180407(R).
• "Direct Observation of Modulation of p–f Hybridization in Unconventional Ordered Phase of PrRu₄P₁₂"
  Hironori Nakao and Kazuaki Iwasa
  J. Phys. Soc. Jpn., 89 (2020) 063703.
• "Electronic Ordering States in Strongly Correlated Electron System Studied by Resonant X-ray Scattering"
  Hironori Nakao and Yuichi Yamasaki
  JPS Conf. Proc., 25 (2019) 011020.
• "Charge disproportionation of Mn 3d and O 2p electronic states depending on strength of p−d hybridization in (LaMnO₃)₂(SrMnO₃)₂ superlattices"
  Hironori Nakao, Chihiro Tabata, Youichi Murakami, Yuichi Yamasaki, Hiroyuki Yamada, Sumio Ishihara, and Masashi Kawasaki
  Phys. Rev. B, 98 (2018) 245146.
• "Chiral-crystal-structure transformations and magnetic states of R₃Rh₄Sn₁₃ (R=La and Ce)"
  Kazuya Suyama, Kazuaki Iwasa, Yuka Otomo, Keisuke Tomiyasu, Hajime Sagayama, Ryoko Sagayama, Hironori Nakao, Reiji Kumai, Yoshinori Kitajima, Françoise Damay, Jean-Michel Mignot, Akira Yamada, Tatsuma D. Matsuda, and Yuji Aoki
  Phys. Rev. B, 97 (2018) 235138.
• "Resonant x-ray scattering study on electronic hybridization in unconventional ordered phase of PrRu₄P₁₂"
  Hironori Nakao, Chihiro Tabata and Kazuaki Iwasa
  J. Phys.: Conf. Ser., 969 (2018) 012118.
• "Absence of Magnetic Long Range Order in Ba₃ZnRu₂O₉: A Spin-Liquid Candidate in the S = 3/2 Dimer Lattice"
  Ichiro Terasaki, Taichi Igarashi, Takayuki Nagai, Kenji Tanabe, Hiroki Taniguchi, Taku Matsushita, Nobuo Wada, Atsushi Takata, Takanori Kida, Masayuki Hagiwara, Kensuke Kobayashi, Hajime Sagayama, Reiji Kumai, Hironori Nakao, and Youichi Murakami
  J. Phys. Soc. Jpn., 86 (2017) 033702.
• "Emergence and magnetic-field variation of chiral-soliton lattice and skyrmion lattice in the strained helimagnet Cu₂OSeO₃"
  Y. Okamura, Y. Yamasaki, D. Morikawa, T. Honda, V. Ukleev, H. Nakao, Y. Murakami, K. Shibata, F. Kagawa, S. Seki, T. Arima, and Y. Tokura
  Phys. Rev. B, 96 (2017) 174417.
• "Small crystal distortion and long-range antiferro-orbital ordering in the spinel oxide CoV₂O₄"
  H. Ishibashi, S. Shimono, K. Tomiyasu, S. Lee, S. Kawaguchi, H. Iwane, H. Nakao, S. Torii, T. Kamiyama, and Y. Kubota
  Phys. Rev. B, 96 (2017) 144424.
• "Three superconducting phases with different categories of pairing in hole- and electron-doped LaFeAs_1−xP_xO"
  S. Miyasaka, M. Uekubo, H. Tsuji, M. Nakajima, S. Tajima, T. Shiota, H. Mukuda, H. Sagayama, H. Nakao, R. Kumai, and Y. Murakami
  Phys. Rev. B, 95 (2017) 214515.
• "Spin State of Co³⁺ in LaCo_1−xRh_xO₃ Studied Using X-ray Absorption Spectroscopy"
  Takaaki Sudayama, Hironori Nakao, Yuichi Yamasaki, Youichi Murakami, Shinichiro Asai, Ryuji Okazaki, Yukio Yasui, and Ichiro Terasaki
  J. Phys. Soc. Jpn., 86 (2017) 094701.
• "Directional electric-field induced transformation from skyrmion lattice to distinct helices in multiferroic Cu₂OSeO₃"
  Y. Okamura, Y. Yamasaki, D. Morikawa, T. Honda, V. Ukleev, H. Nakao, Y. Murakami, K. Shibata, F. Kagawa, S. Seki, T. Arima, and Y. Tokura
  Phys. Rev. B, 95 (2017) 184411.
• "Chiral crystal-structure transformation of R₃Co₄Sn₁₃ (R=La and Ce)"
  Yuka Otomo, Kazuaki Iwasa, Kazuya Suyama, Keisuke Tomiyasu, Hajime Sagayama, Ryoko Sagayama, Hironori Nakao, Reiji Kumai, and Youichi Murakami
  Phys. Rev. B, 94 (2016) 075109.
• "Microscopic Examinations of Co Valences and Spin States in Electron-Doped LaCoO₃"
  Keisuke Tomiyasu, Syun-Ichi Koyama, Masanori Watahiki, Mika Sato, Kazuki Nishihara, Yuki Takahashi, Mitsugi Onodera, Kazuaki Iwasa, Tsutomu Nojima, Hiroyuki Nojiri, Jun Okamoto, Di-Jing Huang, Yuuichi Yamasaki, Hironori Nakao, and Youichi Murakami
  J. Phys. Soc. Jpn., 85 (2016) 094702.
• "Effects of c/a Anisotropy and Local Crystal Structure on Superconductivity in AFe₂(As_1−xP_x)₂ (A = Ba_1−ySr_y, Sr_1−yCa_y and Eu)"
  Toru Adachi, Yusuke Nakamatsu, Tatsuya Kobayashi, Shigeki Miyasaka, Setsuko Tajima, Masayoshi Ichimiya, Masaaki Ashida, Hajime Sagayama, Hironori Nakao, Reiji Kumai, and Youichi Murakami
  J. Phys. Soc. Jpn., 85 (2016) 063705.
• "Observation of magnetic order in multiferroic SmMn₂O₅ studied by resonant x-ray magnetic scattering"
  Y. Ishii, S. Horio, M. Mitarashi, T. Sakakura, M. Fukunaga, Y. Noda, T. Honda, H. Nakao, Y. Murakami, and H. Kimura
  Phys. Rev. B, 93 (2016) 064415.
• "Observation of all-in type tetrahedral displacements in nonmagnetic pyrochlore niobates"
  S. Torigoe, Y. Ishimoto, Y. Aoishi, H. Murakawa, D. Matsumura, K. Yoshii, Y. Yoneda, Y. Nishihata, K. Kodama, K. Tomiyasu, K. Ikeda, H. Nakao, Y. Nogami, N. Ikeda, T. Otomo, and N. Hanasaki
  Phys. Rev. B, 93 (2016) 085109.
• "Surface Ordering of Orbitals at a Higher Temperature in LaCoO₃ Thin Film"
  Yuichi Yamasaki, Jun Fujioka, Hironori Nakao, Jun Okamoto, Takaaki Sudayama, Youichi Murakami, Masao Nakamura, Masashi Kawasaki, Takahisa Arima, and Yoshinori Tokura
  J. Phys. Soc. Jpn., 85 (2016) 023704.
• "Quantum Hall effect in a bulk antiferromagnet EuMnBi₂ with magnetically confined two-dimensional Dirac fermions"
  Hidetoshi Masuda, Hideaki Sakai, Masashi Tokunaga, Yuichi Yamasaki, Atsushi Miyake, Junichi Shiogai, Shintaro Nakamura, Satoshi Awaji, Atsushi Tsukazaki, Hironori Nakao, Youichi Murakami, Taka-hisa Arima, Yoshinori Tokura and Shintaro Ishiwata
  Sci. Adv., 2 (2016) e1501117.
• "Magnetic and Crystal Structures of the Room Temperature Ferrimagnet Sr₃YCo₄O_10.5"
  Akiko Nakao, Hironori Nakao, Kenji Ohoyama, Shuki Torii, Junrong Zhang, Takashi Kamiyama, Youichi Murakami, Wataru Kobayashi, and Ichiro Terasaki
  JPS Conf. Proc. 8 (2015) 034010.
• "Magnetic and electronic states in (LaMnO₃)₂(SrMnO₃)₂ superlattice exhibiting a large negative magnetoresistance"
  Hironori Nakao, Takaaki Sudayama, Masato Kubota, Jun Okamoto, Yuichi Yamasaki, Youichi Murakami, Hiroyuki Yamada, Akihito Sawa, and Kazuaki Iwasa
  Phys. Rev. B, 92 (2015) 245104.
• "Dynamical process of skyrmion-helical magnetic transformation of the chiral-lattice magnet FeGe probed by small-angle resonant soft x-ray scattering"
  Y. Yamasaki, D. Morikawa, T. Honda, H. Nakao, Y. Murakami, N. Kanazawa, M. Kawasaki, T. Arima, and Y. Tokura
  Phys. Rev. B, 92 (2015) 220421(R).
• "Strain-sensitive spin-state ordering in thin films of perovskite LaCoO₃"
  J. Fujioka, Y. Yamasaki, A. Doi, H. Nakao, R. Kumai, Y. Murakami, M. Nakamura, M. Kawasaki, T. Arima, and Y. Tokura
  Phys. Rev. B, 92 (2015) 195115.
• "Two kinds of in-plane resistivity anisotropy in Fe_1+δTe (δ=0.09) as seen via synchrotron radiation x-ray diffraction and in-situ resistivity measurements"
  Taro Nakajima, Tadashi Machida, Hironori Kariya, Daiki Morohoshi, Yuichi Yamasaki, Hironori Nakao, Kazuto Hirata, Takashi Mochiku, Hiroyuki Takeya, Setsuo Mitsuda, and Hideaki Sakata
  Phys. Rev. B, 91 (2015) 205125.
• "X-ray induced lock-in transition of cycloidal magnetic order in a multiferroic perovskite manganite"
  Y. Yamasaki, H. Nakao, Y. Murakami, T. Nakajima, A. Lafuente Sampietro, H. Ohsumi, M. Takata, T. Arima, and Y. Tokura
  Phys. Rev. B, 91 (2015) 100403.
• "Protonation of Pyridyl-Substituted TTF Derivatives: Substituent Effects in Solution and in the Proton-Electron Correlated Charge-Transfer Complexes"
  Sang Chul Lee, Akira Ueda, Akiko Nakao, Reiji Kumai, Hironori Nakao, Youichi Murakami and Hatsumi Mori
  Chem. Euro. J., 20 (2014) 1909.
• "Solid-solid phase interconversion in an organic conductor crystal: hydrogen-bond-mediated dynamic changes in π-stacked molecular arrangement and physical properties"
  Junya Yoshida, Akira Ueda, Akiko Nakao, Reiji Kumai, Hironori Nakao, Youichi Murakami and Hatsumi Mori
  Chem. Comm., 50 (2014) 15557.
• "Evolution of magnetic and structural transitions and enhancement of magnetocaloric effect in Fe_1-xMn_xV₂O₄"
  D. Choudhury, T. Suzuki, D. Okuyama, D. Morikawa, K. Kato, M. Takata, K. Kobayashi, R. Kumai, H. Nakao, Y. Murakami, M. Bremholm, B.B. Iversen, T. Arima, Y. Tokura, and Y. Taguchi
  Phys. Rev. B, 89 (2014) 104427.
• "Hydrogen-Bond-Dynamics-Based Switching of Conductivity and Magnetism: A Phase Transition Caused by Deuterium and Electron Transfer in a Hydrogen-Bonded Purely Organic Conductor Crystal"
  Akira Ueda, Shota Yamada, Takayuki Isono, Hiromichi Kamo, Akiko Nakao, Reiji Kumai, Hironori Nakao, Youichi Murakami, Kaoru Yamamoto, Yutaka Nishio, and Hatsumi Mori
  J. Am. Chem. Soc., 136 (2014) 12184.
• "Structural Modulation of the Cage Lattice System DyB₆"
  Kazuaki Iwasa, Mitsuhide Amano, Hironori Nakao, Youichi Murakami
  JPS Conf. Ser., 3 (2014) 016026.
• "Magnetic and electronic properties of (LaMnO₃)₅(SrMnO₃)₅ superlattice revealed by resonant soft X-ray scattering"
  Masato Kubota, Hiroyuki Yamada, Hironori Nakao, Jun Okamoto, Yuichi Yamasaki, Akihito Sawa, and Youichi Murakami
  Jpn. J. Appl. Phys., 53 (2014) 05FH07.
• "Molecular electronic states in charge transfer complex studied by x-ray absorption spectroscopy"
  Y. Takahashi, H. Nakao, R. Kumai, S. Ishibashi, S. Horiuchi, M. Kohyama, K. Kobayashi, Y. Yamasaki, J. Okamoto, T. Sudayama, Y. Murakami and Y. Tokura
  J. Phys.: Conf. Ser., 502 (2014) 012036.
• "Development of an in-vacuum diffractometer for resonant soft X-ray scattering"
  H. Nakao, Y. Yamasaki, J. Okamoto, T. Sudayama, Y. Takahashi, K. Kobayashi, R. Kumai, and Y. Murakami
  J. Phys.: Conf. Ser., 502 (2014) 012015.
• "Possible Existence of Two Charge-Ordered Phases in Pr_1-xCa_xMnO₃ for 0.40 ≤ x ≤ 0.50"
  Partha Sarathi Mondal, Shinichiro Asai, Taichi Igarashi, Takahiro Suzuki, Ryuji Okazaki, Ichiro Terasaki, Yukio Yasui, Kensuke Kobayashi, Reiji Kumai, Hironori Nakao, and Youichi Murakami
  J. Phys. Soc. Jpn., 83 (2014) 064709.
• "Suppression of Superconductivity around x = 0.5-0.7 in LaFeP_1-xAs_xO_0.95F_0.05"
  K. T. Lai, A. Takemori, S. Miyasaka, S. Tajima, A. Nakao, H. Nakao, R. Kumai, and Y. Murakami
  JPS Conf. Ser., 1 (2014) 012104.
• "Neutron magnetic scattering study in manganite thin film system"
  H. Nakao, H. Yamada, A. Sawa, K. Iwasa, J. Okamoto, T. Sudayama, Y. Yamasaki, Y. Murakami
  Solid State Commun., 185 (2014) 18.
• "Antiferromagnetic Order of the Co²⁺ High-Spin State with a Large Orbital Angular Momentum in La_1.5Ca_0.5CoO₄"
  Jun Okamoto, Hironori Nakao, Yuichi Yamasaki, Hiroki Wadati, Arata Tanaka, Masato Kubota, Kazumasa Horigane, Youichi Murakami, and Kazuyoshi Yamada
  J. Phys. Soc. Jpn., 83 (2014) 044705.
• "Uniaxial-Pressure Effects on Spin-Driven Lattice Distortions in Geometrically Frustrated Magnets CuFe_1-xGa_xO₂ (x=0, 0.035)"
  Taro Nakajima, Yusuke Iguchi, Hiromu Tamatsukuri, Setsuo Mitsuda, Yuichi Yamasaki, Hironori Nakao, and Noriki Terada
  J. Phys. Soc. Jpn., 82 (2013) 114711.
• "Spin-Orbital Superstructure in Strained Ferrimagnetic Perovskite Cobalt Oxide"
  J. Fujioka, Y. Yamasaki, H. Nakao, R. Kumai, Y. Murakami, M. Nakamura, M. Kawasaki, and Y. Tokura
  Phys. Rev. Lett., 111 (2013) 027206.
• "Spin-state responses to light impurity substitution in low-spin perovskite LaCoO₃"
  Keisuke Tomiyasu, Yuuki Kubota, Saya Shimomura, Mitsugi Onodera, Syun-Ichi Koyama, Tsutomu Nojima, Sumio Ishihara, Hironori Nakao, and Youichi Murakami
  Phys. Rev. B, 87 (2013) 224409.
• "Change of Electronic State and Crystal Structure by Postannealing in Superconducting SrFe₂(As_0.65P_0.35)₂"
  T. Kobayashi, S. Miyasaka, S. Tajima, T. Nakano, Y. Nozue, N. Chikumoto, H. Nakao, R. Kumai and Y. Murakami
  Phys. Rev. B, 87 (2013) 174520.