Spin and charge excitations in high-Tc superconducting cuprates studied by resonant inelastic x-ray scattering

• Project/Area Number: 25400333
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Ishii Kenji 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究主幹 (40343933)
• Co-Investigator(Kenkyū-buntansha): FUJITA Masaki 東北大学, 金属材料研究所, 教授 (20303894) ; WAKIMOTO Shuichi 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究主幹 (40399415)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: Ｘ線散乱 / 非弾性散乱 / 銅酸化物超伝導体 / 磁気励起 / 電荷励起 / スピン励起

Outline of Final Research Achievements

Resonant inelastic x-ray scattering (RIXS) has recently made significant progress as a spectroscopic technique. We observed spin and charge excitations in high-Tc superconducting cuprates using this technique and studied electron dynamics in carrier-doped Mott insulators. Spin excitations in electron-doped system shift to higher energy accompanied with broadening of the width upon doping. On the other hand, spin excitations in hole-doped systems are also broadened but keep the energy almost unchanged from the parent compound. In addition, dispersive charge excitations are observed above the spin excitations in electron-doped systems and peak energy is found to move toward higher energy with increasing doping.

Research Products

• [Int'l Joint Research] Politenico di Milano(Italy)
• [Int'l Joint Research] European Synchrotron Radiation Facility(France)
• [Journal Article] Observation of momentumresolved charge fluctuations proximate to the charge-order phase using resonant inelastic x-ray scattering (2016)
  • Author(s): M. Yoshida, K. Ishii, M. Naka, S. Ishihara, I. Jarrige, K. Ikeuchi, Y. Murakami, K. Kudo, Y. Koike, T. Nagata, Y. Fukada, N. Ikeda & J. Mizuki
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 23611-23611
  • DOI: 10.1038/srep23611
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 共鳴非弾性Ｘ線散乱を用いた強相関電子系研究の進展 (2016)
  • Author(s): 石井賢司
  • Journal Title: 固体物理 Volume: 79 Pages: 79-92
  • NAID: 40020747506
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Ｈｉｇｈ ｅｎｅｒｇｙ ｍａｇｎｅｔｉｃ ｅｘｃｉｔａｔｉｏｎｓ ｉｎ ｏｖｅｒｄｏｐｅｄ Ｌａ２－ｘＳｒｘＣｕＯ４ ｓｔｕｄｉｅｄ ｂｙ ｎｅｕｔｒｏｎ ａｎｄ ｒｅｓｏｎａｎｔ ｉｎｅｌａｓｔｉｃ Ｘ－ｒａｙ ｓｃａｔｔｅｒｉｎｇ (2015)
  • Author(s): Ｓ． Ｗａｋｉｍｏｔｏ， Ｋ． Ｉｓｈｉｉ， Ｈ． Ｋｉｍｕｒａ， Ｍ． Ｆｕｊｉｔａ， Ｇ． Ｄｅｌｌｅａ， Ｋ． Ｋｕｍｍｅｒ， Ｌ． Ｂｒａｉｃｏｖｉｃｈ， Ｇ． Ｇｈｉｒｉｎｇｈｅｌｌｉ， Ｌ．Ｍ． Ｄｅｂｅｅｒ－Ｓｃｈｍｉｔｔ， Ｇ．Ｅ． Ｇｒａｎｒｏｔｈ
  • Journal Title: Ｐｈｙｓｉｃａｌ Ｒｅｖｉｅｗ Ｂ Volume: ９１ Issue: 18
  • DOI: 10.1103/physrevb.91.184513
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Electron Dynamics of Copper Oxide Superconductors Studied by Soft X-ray, Hard X-ray and Neutron Inelastic Scattering (2015)
  • Author(s): 石井賢司, 藤田全基
  • Journal Title: Nihon Kessho Gakkaishi Volume: 57 Issue: 1 Pages: 20-26
  • DOI: 10.5940/jcrsj.57.20
  • NAID: 130004799733
  • ISSN: 0369-4585, 1884-5576
  • Peer Reviewed / Open Access
• [Journal Article] 電子ドープ型銅酸化物超伝導体の高エネルギー磁気励起 (2015)
  • Author(s): 藤田全基, 石井賢司
  • Journal Title: 日本中性子科学会誌「波紋」 Volume: 25 Pages: 18-21
  • NAID: 130007510541
  • Peer Reviewed
• [Journal Article] ３種の量子ビームを用いた電子の動きの観測 (2014)
  • Author(s): 石井賢司, 藤田全基
  • Journal Title: Isotope News Volume: 728 Pages: 10-13
• [Journal Article] High-energy spin and charge excitations in electron-doped co opper oxide superconductors (2014)
  • Author(s): K. Ishii, M. Fujita, K. Yamada
  • Journal Title: Nature Commun. Volume: 5 Issue: 1
  • DOI: 10.1038/ncomms4714
  • Peer Reviewed
• [Journal Article] Momentum-resolved resonant inelastic x-ray scattering on a single crystal under high pressure (2014)
  • Author(s): Masahiro Yoshida, Kenji Ishii, Ignace Jarrige, Tetsu Watanuki, Kazutaka Kudo, Yoji Koike, Ken'ichi Kumagai, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, and Jun'ichiro Mizuki
  • Journal Title: Journal of Synchrotron Radiation Volume: 21 Issue: 1 Pages: 131-135
  • DOI: 10.1107/s1600577513028944
  • Peer Reviewed
• [Presentation] Momentum-resolved charge fluctuations proximate to the charge-order phase measured by resonant inelastic x-ray scattering (2016)
  • Author(s): K. Ishii, M. Yoshida, M. Naka, S. Ishihara, I. Jarrige, K. Ikeuchi, Y. Murakami, K. Kudo, Y. Koike, T. Nagata, Y. Fukada, N. Ikeda, and J. Mizuki
  • Organizer: International Conference on Low-Energy Electrodynamics in Solids 2016
  • Place of Presentation: ホテルラフォーレ琵琶湖（滋賀県守山市）
  • Year and Date: 2016-05-29
  • Int'l Joint Research
• [Presentation] 銅酸化物におけるスピン波励起と世界の硬Ｘ線RIXSの現状 (2016)
  • Author(s): 石井賢司
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県仙台市）
  • Year and Date: 2016-03-19
  • Invited
• [Presentation] Spin and charge excitations in doped cuprates (2015)
  • Author(s): Kenji Ishii
  • Organizer: The 9th international conference on Inelastic X-ray Scattering
  • Place of Presentation: 新竹 (台湾)
  • Year and Date: 2015-11-22
  • Int'l Joint Research / Invited
• [Presentation] Ｘ線非弾性散乱による電子の動的構造の研究 (2015)
  • Author(s): 石井賢司
  • Organizer: PF研究会「次世代放射光光源を用いた構造物性研究への期待」
  • Place of Presentation: エネルギー加速器研究機構（茨城県つくば市）
  • Year and Date: 2015-07-27
  • Invited
• [Presentation] 中性子散乱でみる銅酸化物における磁気相間の電子・ホール非対称性 (2015)
  • Author(s): 藤田全基
  • Organizer: 日本物理学会 第70回年次大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-23
• [Presentation] 共鳴非弾性Ｘ線散乱による電子ドープ型銅酸化物超伝導体の磁気励起と電荷励起 (2015)
  • Author(s): 石井賢司, 藤田全基, 佐々木隆了, M. Minola, G. Dellea, C. Mazzoli, K. Kummer, G. Ghiringhelli, L. Braicovich, 遠山貴己, 山田和芳, 吉田雅洋, 黒岡雅仁, 清水裕友, 水木純一郎
  • Organizer: 第28回日本放射光学会年会・放射光科学合同シンポジウム
  • Place of Presentation: 立命館大学（滋賀県草津市）
  • Year and Date: 2015-01-11
• [Presentation] Ｘ線・中性子非弾性散乱による電子ドープ型銅酸化物超伝導体のスピン・電荷励起の観測 (2014)
  • Author(s): 石井賢司, 藤田全基, 佐々木隆了, M. Minola, G. Dellea, C. Mazzoli, K. Kummer, G. Ghiringhelli, L. Braicovich, 遠山貴己, 堤健之, 佐藤研太朗, 梶本亮一, 池内和彦, 山田和芳, 吉田雅洋, 黒岡雅仁, 水木純一郎
  • Organizer: 日本中性子科学会第14回年会
  • Place of Presentation: 北海道立道民活動センターかでる（札幌市）
  • Year and Date: 2014-12-12
• [Presentation] Spin and charge excitations in electron-doped cuprates (2014)
  • Author(s): Kenji Ishii
  • Organizer: 東北大金研ワークショップ "Research Frontier of Transition-metal Compounds Opened by Advanced Spectroscopies"
  • Place of Presentation: 東北大学（宮城県仙台市）
  • Year and Date: 2014-10-01
• [Presentation] Neutron and resonant inelastic x-ray scattering study of magnetic excitations in hole-doped La2-xSrxCuO4 (2014)
  • Author(s): Shuichi Wakimoto
  • Organizer: 東北大金研ワークショップ "Research Frontier of Transition-metal Compounds Opened by Advanced Spectroscopies"
  • Place of Presentation: 東北大学（宮城県仙台市）
  • Year and Date: 2014-10-01
  • Invited
• [Presentation] 共鳴非弾性X線散乱による電子ドープ型銅酸化物超伝導体の磁気・電荷励起 (2014)
  • Author(s): 石井賢司, 藤田全基, 佐々木隆了, M. Minola, G. Dellea, C. Mazzol, K. Kummer, G. Ghiringhelli, L. Braicovich, 遠山貴己, 山田和芳, 吉田雅洋, 黒岡雅仁, 水木純一郎
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 神奈川県平塚市
• [Presentation] 放射光と中性子を用いた過剰ドープLSCOの磁気励起の研究 (2014)
  • Author(s): 脇本秀一, 石井賢司, 木村宏之, 藤田全基, 梶本亮一, 池内和彦, G. E. Granroth, G. Ghiringhelli, L. Braicovich
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 神奈川県平塚市
• [Presentation] RIXSによる銅酸化物・イリジウム酸化物の磁気励起 (2013)
  • Author(s): 石井賢司
  • Organizer: CROSSroads of Users and J-PARC 第9回「超伝導、磁性とフラストレーション」
  • Place of Presentation: 茨城県東海村
  • Invited
• [Presentation] Resonant inelastic x-ray scattering studies of charge excitations (2013)
  • Author(s): Kenji Ishii
  • Organizer: Light and Particle Beams in Materials Science 2013
  • Place of Presentation: つくば市
  • Invited
• [Presentation] Carrier Dynamics in Doped High-Tc Cuprates Studied by Cu K-edge RIXS (2013)
  • Author(s): Kenji Ishii
  • Organizer: 8th International Conference on Inelastic X-ray Scattering
  • Place of Presentation: California, USA
  • Invited
• [Presentation] Spin and charge excitations in Nd2-xCexCuO4 using resonant inelastic x-ray scattering (2013)
  • Author(s): Kenji Ishii
  • Organizer: 金研ワークショップ "Superconductivity research advanced by new materials and spectroscopies"
  • Place of Presentation: 宮城県仙台市
• [Presentation] 電子ドープ系銅酸化物超伝導体における放射光と中性子の相補利用研究
  • Author(s): 石井賢司
  • Organizer: 物構研サイエンスフェスタ2013
  • Place of Presentation: 茨城県つくば市
  • Invited