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Observation of local orbital states and their role for the electronic state

Research Project

Project/Area Number 15K05167
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics II
Research InstitutionNagoya University

Principal Investigator

Kobayashi Yoshiaki  名古屋大学, 理学研究科, 准教授 (60262846)

Co-Investigator(Kenkyū-buntansha) 伊藤 正行  名古屋大学, 理学研究科, 教授 (90176363)
Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsネマチック状態 / 鉄系超伝導体 / 軌道秩序 / 核磁気共鳴 / 電場勾配 / ナイトシフト / 磁気ゆらぎ / 電荷ゆらぎ / 電子ネマチック状態 / 斜方晶歪 / 電気四重極周波数 / 電荷分布 / 強相関電子系 / 超伝導 / X線回折 / 中性子散乱 / 局所対称性の破れ / 鉄面内異方性
Outline of Final Research Achievements

Nematic fluctuation was investigated from 75As nuclear magnetic resonance for the iron based superconductors Ba(Fe1-xCox)2As2, NaFeAs, and LiFeAs. We found that the electric nematic fluctuation obtained from Raman scattering can be monitored from the temperature and x dependence of the in-plane anisotropy (eta) of the electric field gradient at the As nuclear position. The eta for all samples shows Curie-Weiss type temperature dependence, where the fitting parameters, C_eta and T_eta, which correspond to Curie constant and the Weiss temperatures, respectively, systematically have x-dependences. The T_eta’s show roughly ~ Ts-50 (K) in x <0.05 where the nematic order emerges (Ts is nematic ordered temperature). Similarly with the result of Raman scattering, the T_eta becomes zero with x~0.055. At x>0.055, we found that the T_eta’s become negative, suggesting the existence of antiferro-type orbital fluctuation.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report

Research Products

(29 results)

All 2018 2017 2016 2015 Other

All Int'l Joint Research Journal Article Presentation

  • [Int'l Joint Research] University of Pavia-CNISM(Italy)

    • Related Report
      2017 Annual Research Report
  • [Journal Article] Nematic fluctuations in iron arsenides NaFeAs and LiFeAs probed by 75As NMR2018

    • Author(s)
      M. Toyoda, Y. Kobayashi, and M. Itoh
    • Journal Title

      Phys. Rev. B

      Volume: 97

    • DOI

      10.1103/physrevb.97.094515

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] In-plane anisotropy of the electric field gradient in Ba(Fe1-xCox)2As2 observed by 75As NMR2018

    • Author(s)
      Masayuki Toyoda, Akihiro Ichikawa, Yoshiaki Kobayashi, Masatoshi Sato, and Masayuki Itoh
    • Journal Title

      Phys. Rev. B

      Volume: 97

    • DOI

      10.1103/physrevb.97.174507

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors2017

    • Author(s)
      M. Moroni, P. Carretta, G. Allodi, R. De Renzi, M. N. Gastiasoro, B. M. Andersen, P. Materne, H. -H. Klauss, Y. Kobayashi, M. Sato, and S. Sanna
    • Journal Title

      Phys. Rev. B

      Volume: 95

    • DOI

      10.1103/physrevb.95.180501

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor2017

    • Author(s)
      Ryousuke Kurihara, Keisuke Mitsumoto, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Yoshiaki Kobayashi, Masatoshi Sato
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 86 Issue: 6 Pages: 064706-064706

    • DOI

      10.7566/jpsj.86.064706

    • NAID

      40021221785

    • ISSN
      0031-9015, 1347-4073
    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Local electronic state in the half-metallic ferromagnet CrO2 investigated by site selective 53Cr NMR measurements.2016

    • Author(s)
      Hikaru Takeda, Yasuhiro Shimizu, Yoshiaki Kobayashi, Masayuki Itoh, Takaaki Jin-no, Masahiko Isobe, Yutaka Ueda, Sho Yoshida, Yuji Muraoka, Takayoshi Yokoya
    • Journal Title

      Physical Review B

      Volume: 93

    • DOI

      10.1103/physrevb.93.235129

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] X-ray diffraction study of spontaneous strain in the iron-based superconductor Sr4V2Fe2As2O6-x2015

    • Author(s)
      Masahiro Saito, Hideshi Fujishita, Hiroyuki Okamoto, Yoshiaki Kobayashi, Masatoshi Sato
    • Journal Title

      Physica C: Superconductivity and its Applications

      Volume: 519 Pages: 142-146

    • DOI

      10.1016/j.physc.2015.08.014

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)102015

    • Author(s)
      K. Ikeuchi, Y. Kobayashi, K. Suzuki, M. Itoh, R. Kajimoto, P. Bourges, A. D. Christianson, H. Nakamura, M. Machida, M. Sato
    • Journal Title

      J. Phys.: Condens. Matter

      Volume: 27

    • DOI

      10.1088/0953-8984/27/46/465701

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Enhancement of low-frequency fluctuations and superconductivity breakdown in Mn-doped La1-yYyFeAsO0.89F0.11 superconductors2015

    • Author(s)
      F. Hammerath, M. Moroni, L. Bossoni, S. Sanna, R. Kappenberger, S. Wurmehl, A. U. B. Wolter, M. A. Afrassa, Y. Kobayashi, M. Sato, B. B&#252;chner, and P. Carretta
    • Journal Title

      Phys. Rev. B

      Volume: 92 Pages: 020505-020505

    • DOI

      10.1103/physrevb.92.020505

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] BaTi2As2Oの低温相における可能な結晶構造について2017

    • Author(s)
      稲冨健太, 小林義明, 伊藤正行
    • Organizer
      日本物理学会 第72回年次大会(2017年)
    • Place of Presentation
      大阪大学 豊中キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] 軌道縮退系バナジウム酸化物α-Sr2VO4の磁性とその解析2017

    • Author(s)
      神野貴昭,加藤優介, 清水康弘, 小林義明, 伊藤正行, 櫻井裕也, 高莚楊弘敦
    • Organizer
      日本物理学会 第72回年次大会(2017年)
    • Place of Presentation
      大阪大学 豊中キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] RuP単結晶に対する31P-NMRによる研究2017

    • Author(s)
      李尚, 小林義明, 伊藤正行, 平井大悟郎, 広井善二, 高木英典
    • Organizer
      日本物理学会 第72回年次大会(2017年)
    • Place of Presentation
      大阪大学 豊中キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Aサイト秩序型ペロブスカイトLnCu3Cr4O12 (Ln=Ca, La, Bi)の低温電子状態2017

    • Author(s)
      小柳大樹, 小林義明, 伊藤正行, 磯部正彦, 高木英典, 桜井裕也
    • Organizer
      日本物理学会 第72回年次大会(2017年)
    • Place of Presentation
      大阪大学 豊中キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Low-temperature electronic state in the titanium-oxypnictide BaTi2As2O2017

    • Author(s)
      Y. Kobayashi, K. Inadomi, M. Itoh
    • Organizer
      28th International Conference on Low Temperature Phyiscs
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] チタンオキソニクタイドBaTi2As2Oの結晶・電子構造について2017

    • Author(s)
      稲冨健太, 小林義明, 伊藤正行
    • Organizer
      日本物理学会 2017年秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 様々な鉄系超伝導体における局所構造のFe面内対称性の破れについて2016

    • Author(s)
      豊田真幸, 小林義明, 伊藤正行, 佐藤正俊
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      金沢大学 角間キャンパス
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] (Ca,La)Fe2As2におけるアニール効果-NMRにおける局所構造観測-2016

    • Author(s)
      長谷川源, 村田祐亮, 小林義明, 伊藤正行
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      金沢大学 角間キャンパス
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] NMRで見たチタン酸化ニクタイド物質BaTi2As2Oの低温電子状態2016

    • Author(s)
      稲冨健太, 小林義明, 伊藤正行
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      金沢大学 角間キャンパス
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] A-サイト秩序型ぺロブスカイト酸化物CaCu3Cr4O12の低温磁気秩序状態のNMRによる研究2016

    • Author(s)
      小柳大樹, 小林義明, 伊藤正行, 磯部正彦A, 高木英典, 桜井裕也
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      金沢大学 角間キャンパス
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] 75As NMR studies on the nematic state in the iron pnictide NaFeAs2016

    • Author(s)
      Masayuki Toyoda, Yoshiaki Kobayashi, Masayuki Itoh
    • Organizer
      International conference on Strongly correlated electron systems
    • Place of Presentation
      Zhejiang University, Hangzhou, China
    • Year and Date
      2016-05-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] NMR study on electronic and magnetic properties of Fe-based ladder compounds AFe2Se3(A = Ba, Cs)2016

    • Author(s)
      Kaoru Okada, Yoshiaki Kobayashi, Masayuki Itoh, Yasuyuki Hirata, Kazuki Hashizume, Takuya Aoyama, Kenya Ohgushi
    • Organizer
      International conference on Strongly correlated electron systems
    • Place of Presentation
      Zhejiang University, Hangzhou, China
    • Year and Date
      2016-05-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Magnetic order and valence change in the A-site ordered perovskite Cr oxide CaCu3Cr4O12 probed by 63,65Cu NQR2016

    • Author(s)
      Yoshiaki Kobayashi, Daiki Koyanagi, Masayuki Itoh, Masahiko Isobe, Hidenori Takagi, Hiroya Sakurai
    • Organizer
      International conference on Strongly correlated electron systems
    • Place of Presentation
      Zhejiang University, Hangzhou, China
    • Year and Date
      2016-05-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Magnetic fluctuations of Ru1-xRhxP investigated by 31P NMR2016

    • Author(s)
      Shang Li, Yoshiaki Kobayashi, Masayuki Itoh, Daigorou Hirai, Zenji Hiroi, Hidenori Takagi
    • Organizer
      International conference on Strongly correlated electron systems
    • Place of Presentation
      Zhejiang University, Hangzhou, China
    • Year and Date
      2016-05-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Orbital degenerated 3d1 system α-Sr2VO4 investigated by 51V NMR2016

    • Author(s)
      Yusuke Kato, Yasuhiro Shimizu, Yoshiaki Kobayashi, Masayuki Itoh, Hiroya Sakurai
    • Organizer
      International conference on Strongly correlated electron systems
    • Place of Presentation
      Zhejiang University, Hangzhou, China
    • Year and Date
      2016-05-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 鉄系超伝導体NaFeAsにおけるAs核スピン格子緩和率のFe面内異方性2016

    • Author(s)
      豊田真幸, 小林義明, 伊藤正行
    • Organizer
      日本物理学会第 71 回年次大会(2016 年)
    • Place of Presentation
      東北学院大学 泉キャンパス
    • Year and Date
      2016-03-19
    • Related Report
      2015 Research-status Report
  • [Presentation] 鉄系超伝導体Sr2VO3-xFeAsにおける酸素数とTcの関係2016

    • Author(s)
      長谷川源, 小林義明, 伊藤正行
    • Organizer
      日本物理学会第 71 回年次大会(2016 年)
    • Place of Presentation
      東北学院大学 泉キャンパス
    • Year and Date
      2016-03-19
    • Related Report
      2015 Research-status Report
  • [Presentation] 鉄系超伝導体Ca10-4-8の磁気励起、格子振動の温度変化2015

    • Author(s)
      池内和彦, 佐藤正俊, 小林義明A, 鈴木一範, 伊藤正行, 梶本亮一
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      関西大学 千里山キャンパス
    • Year and Date
      2015-09-16
    • Related Report
      2015 Research-status Report
  • [Presentation] 鉄系超伝導体LiFeAsとNaFeAsにおけるFe面内異方性2015

    • Author(s)
      豊田真幸, 小林義明, 伊藤正行, 佐藤正俊
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      関西大学 千里山キャンパス
    • Year and Date
      2015-09-16
    • Related Report
      2015 Research-status Report
  • [Presentation] “NMR studies on the in-plane anisotropy of the iron pnictide LiFeA2015

    • Author(s)
      M. Toyoda, Y. Kobayashi, M. Itoh, M. Sato
    • Organizer
      The 20th International Conference on Magnetism (ICM2015)
    • Place of Presentation
      Barcelona, Spain
    • Year and Date
      2015-07-05
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2020-05-15  

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