Study of correlation between the electronic and crystal structures and the superconductivity in iron-based superconductors under pressure by x-ray diffraction and x-ray emission spectroscopy

• Project/Area Number: 15K05194
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Yamaoka Hitoshi 国立研究開発法人理化学研究所, 放射光科学総合研究センター, 専任研究員 (30239850)
• Co-Investigator(Kenkyū-buntansha): 佐藤 仁 広島大学, 放射光科学研究センター, 准教授 (90243550) ; 水木 純一郎 関西学院大学, 理工学部, 教授 (90354977)
• Co-Investigator(Renkei-kenkyūsha): KAGAYAMA TOMOKO 大阪大学, 極限量子科学研究センター, 准教授 (40274675) ; TAKESHITA NAO 独立行政法人産業技術総合研究所, 電子光技術研究部門, 主任研究員 (60292760) ; SHIMADA KENYA 広島大学, 放射光科学研究センター, 教授 (10284225)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 高温超伝導 / 高圧 / X線発光分光 / X線回折 / 鉄系超伝導体 / X線非弾性散乱 / 鉄系超伝導 / 鉄系超電導

Outline of Final Research Achievements

Recently, in iron-based superconductors two superconducting (SC) domes, which are induced by pressure or doping, have been found and attracts many interests because of the origin of the two SC regions are possibly different. In this study we clarified the crystal and electronic structures of KxFe2-ySe, (NH3)yCs0.4FeSe, LnFeAsO1-xHx, which have two SC domes. The results show that tetragonal to collapsed tetragonal phase transition and electron correlation play key roles for the emergence of the SC2 and the superconductor type of SC2 may be different from that of SC1. In LaFeAsO1-xHx the superconductivity emerged in the region far from the tetrahedral crystal structure, while in SmFeAsO1-xHx it was observed near the tetrahedral crystal structure.

Research Products

• [Journal Article] Pressure-induced anomalous valence crossover in cubic YbCu5-based compounds (2017)
  • Author(s): H. Yamaoka, N. Tsujii, M.T. Suzuki, Y. Yamamoto, I. Jarrige, H. Sato, J.F. Lin, T. Mito, J. Mizuki, H. Sakurai, O. Sakai, N. Hiraoka, H. Ishii, K.D. Tsuei, M. Giovannini, E. Bauer
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 5846-5846
  • DOI: 10.1038/s41598-017-06190-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electronic structures and spin states of BaFe2As2 and SrFe2As2 probed by x-ray emission spectroscopy at Fe and As K-absorption edges (2017)
  • Author(s): Hitoshi Yamaoka, Yoshiya Yamamoto, Jung-Fu Lin, Junjie J. Wu, Xiancheng Wang, Changqing Jin, Masahiro Yoshida, Seiichiro Onari, Shigeyuki Ishida Yoshinori Tsuchiya, Nao Takeshita, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, Paul Chow, Yuming Xiao, Jun'ichiro Mizuki
  • Journal Title: Physical Review B Volume: 96 Issue: 8
  • DOI: 10.1103/physrevb.96.085129
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electronic structure of ferromagnetic heavy fermion, YbPdSi, YbPdGe, and YbPtGe studied by photoelectron spectroscopy, x-ray emission spectroscopy, and DFT+DMFT calculations (2017)
  • Author(s): H. Yamaoka, P. Thunstrom, N. Tsujii, K. Katoh, Y. Yamamoto, E.F. Schwier, K. Shimada, H. Iwasawa, M. Arita, I.Jarrige, N. Hiraoka, H. Ishii, K.D. Tsuei, J. Mizuki
  • Journal Title: Journal of Physics: Condensed Matter Volume: 29 Issue: 47 Pages: 475502-475502
  • DOI: 10.1088/1361-648x/aa8b98
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Origin of pressure-induced superconducting phase in KxFe2－ySe2 studied by synchrotron x-ray diffraction and spectroscopy (2016)
  • Author(s): Y. Yamamoto, H. Yamaoka, M. Tanaka, H. Okazaki, T. Ozaki, Y. Takano, J.-F. Lin, H. Fujita, T. Kagayama, K. Shimizu, N. Hiraoka, H. Ishii, Y.-F. Liao, K.-D. Tsuei, and J. Mizuki,
  • Journal Title: Scientific Report Volume: 6 Issue: 1 Pages: 30946-30952
  • DOI: 10.1038/srep30946
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Pressure dependence of the electronic structure of 4f and 3d electron systems studied by X-ray emission spectroscopy (2016)
  • Author(s): H. Yamaoka
  • Journal Title: High Pressure Research Volume: 36 Issue: 3 Pages: 267-274
  • DOI: 10.1080/08957959.2016.1203914
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Pressure-induced phase transition in LaCo5 studied by x-ray emission spectroscopy, x-ray diffraction, and density functional theory (2016)
  • Author(s): H. Yamaoka, Y. Yamamoto, E.F. Schwier, N. Tsujii, M. Yoshida, Y. Ohta, H. Sakurai, J. Lin, N. Hiraoka, H. Ishii, K. Tsuei, M. Arita, K. Shimada, J. Mizuki
  • Journal Title: Phys. Rev. B Volume: 94 Issue: 16 Pages: 165156-165156
  • DOI: 10.1103/physrevb.94.165156
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Pressure and temperature dependence of the Ce valence and c－f hybridization gap in CeTIn5(T=Co,Rh,Ir) heavy-fermion superconductors (2015)
  • Author(s): H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki
  • Journal Title: Physical Review B Volume: 92 Issue: 23
  • DOI: 10.1103/physrevb.92.235110
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 鉄系超伝導体LnFeAsO1-xHxの高圧下でのX線発光分光、吸収分光、X線回折測定 (2018)
  • Author(s): 川井拓真, 山本義哉, 山岡人志, 吉田雅洋, 石井啓文, 平岡望, Ku-Ding Tsuei, Jung-Fu Lin, 山浦淳一, 飯村壮史, 松村聡, 細野秀雄, 水木純一郎
  • Organizer: 第31回日本放射光学会年会・放射光科学合同シンポジウム
• [Presentation] 鉄系超伝導体(NH3)yCs0.4FeSeの低温高圧下のXRD測定 (2017)
  • Author(s): 山本義哉，山岡人志，庄内星加，Lu Zheng，久保園芳博，平尾直久，今田沙織，大石泰生，水木純一郎
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学豊中キャンパス（大阪府豊中市）
  • Year and Date: 2017-03-18
• [Presentation] 鉄系超伝導体(NH3)yCs0.4FeSeの低温高圧下のXRD測定 (2017)
  • Author(s): 山本義哉，山岡人志，庄内星加，Lu Zheng，久保園芳博，平尾直久，今田沙織，大石泰生，水木純一郎
  • Organizer: 日本物理学会第72回年次大会
• [Presentation] 鉄系超伝導体KxFe2-ySe2の高圧下メスバウアー分光測定 (2017)
  • Author(s): 山本義哉，三井隆也，北尾真司，瀬戸誠，溝畑尚幸，尾崎壽紀，山岡人志，水木純一郎,
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] 電子及びホールドープされたBaFe2As2の電子状態：X 線発光分光による測定 (2016)
  • Author(s): 山岡人志, 山本義哉, 吉田雅, 石田茂之, 土屋佳則, 竹下 直, Jung-Fu Lin, 平岡 望, 石井啓文, Ku-Ding Tsuei , 水木純一郎
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 仙台市 東北学院大学泉キャンパス
  • Year and Date: 2016-03-21
• [Presentation] 高圧下の発光分光測定：重い電子化合物から鉄系超伝導体まで (2016)
  • Author(s): 山岡人志
  • Organizer: 日本放射光学会年会
  • Place of Presentation: 千葉県柏市 柏の葉カンファレンスセンター
  • Year and Date: 2016-01-10
  • Invited
• [Presentation] Electronic and crystal structures of KxFe2-ySe2 under high pressure studied by x-ray emission spectroscopy and x-ray diffraction (2015)
  • Author(s): Y. Yamamoto, H. Yamaoka, Y. Ohta, J.-F. Lin, H. Ishii, N. Hiraoka, K.-D. Tsuei, H. Fujita, T. Kagayama, K. Shimizu, M. Tanaka, H. Okazaki, Y. Ozaki, Y. Takano, and J. Mizuki,
  • Organizer: The 9th International Conference on Inelastic X-ray Scattring
  • Place of Presentation: 台湾新竹市 National Sychrotron Radiateon Center, Hsinchu, Taiwan
  • Year and Date: 2015-11-22
  • Int'l Joint Research
• [Presentation] 鉄系超伝導体LaFeAsO1-xHxの高圧下でのX線回折とFe KβX線発光分光測定 (2015)
  • Author(s): 山本義哉、山岡人志、吉田雅洋，太田雄，石井啓文，平岡 望，Ku-Ding Tsuei，Jung-Fu Lin，石井賢司，山浦淳一，飯村壮史，松石聡，細野秀雄，水木純一郎
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 大阪府吹田市 関西大学千里山キャンパス
  • Year and Date: 2015-09-18
• [Remarks] 鉄系高温超伝導体の圧力誘起新超伝導相のベールを剥ぐ ;高温超伝導機構解明に迫る;（プレスリリース）
  • URL: http://www.spring8.or.jp/ja/news_publications/press_release/2016/160809/