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NMR study under high pressure: investigation of superconductivity induced by orbital fluctuations and superconductivity accompanied by antiferromagnetic ordering

Research Project

Project/Area Number 23340101
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics II
Research InstitutionKyoto University

Principal Investigator

FUJIWARA Naoki  京都大学, 人間・環境学研究科(研究院), 准教授 (60272530)

Co-Investigator(Kenkyū-buntansha) UWATOKO Yoshiya  東京大学, 物性研究所, 教授 (40213524)
Co-Investigator(Renkei-kenkyūsha) HOSONO Hideo  東京工業大学, フロンティアリサーチセンター, 教授 (30157028)
TAKAHASHI Hiroki  日本大学, 文理学部, 教授 (80188044)
Project Period (FY) 2011-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2012: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2011: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Keywords高温超伝導 / 核磁気共鳴 / 高圧技術 / 相転移 / 鉄ヒ素系化合物 / スピン密度波 / 磁性 / 鉄砒素系化合物
Research Abstract

To investigate the possibility of superconductivity induced by orbital fluctuations, we performed nuclear-magnetic-resonance measurements on LaFeAsO1-xHx in a heavily electron-doped regime where spin fluctuations are supposed to be fairly small. We unexpectedly discovered antiferromagnetic ordering in this regime and obtained a brand-new electronic phase diagram, contrary to the commonly-believed expectation in the field of strongly electron systems.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (50 results)

All 2014 2013 2012 2011 Other

All Journal Article (14 results) (of which Peer Reviewed: 14 results) Presentation (30 results) (of which Invited: 1 results) Remarks (6 results)

  • [Journal Article] NMR Study on a Pnictide Superconductor LaFeAsO_<1-x>H_x in a H-O verdoved Regime : Revival of Antiferromagnetic Fluctuations2014

    • Author(s)
      Naoki Fujiwara, et. al.
    • Journal Title

      J. Supercond. Nov. Magn.

      Volume: 27 Issue: 4 Pages: 933-936

    • DOI

      10.1007/s10948-013-2413-z

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] A NiCrAl pressure cell up to 4.6 GPa and its application to cuprate and pnictide superconductors2014

    • Author(s)
      N. Fujiwara, Y. Uwatoko, and T. Matsumoto
    • Journal Title

      Journal of Physics : Conf. Ser

      Volume: 500 Pages: 32008-32008

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Detection of antiferromagnetic ordering in heavily doped LaFeAsO_<1-x>H_x pnictide superconductors using nuclear- magnetic-resonance techniques2013

    • Author(s)
      N. Fujiwara, S. Tsutsumi, S. Iimura, S. Matsuishi, H. Hosono, Y. Yamakawa, and H. Kontani
    • Journal Title

      Physical Review Letters

      Volume: 111 Issue: 9 Pages: 970021-5

    • DOI

      10.1103/physrevlett.111.097002

    • NAID

      120005333784

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Detection of Antiferromagnetic Ordering in Heavily Doped LaFeAsO_<1-x>H_x Pnictide Superconductors Using Nuclear-Magnetic-Resonance Techniques2013

    • Author(s)
      Naoki Fujiwara, et. al.
    • Journal Title

      Phys. Rev. Lett.

      Volume: 111 Issue: 4 Pages: 0411061-5

    • DOI

      10.1103/physrevb.88.041106

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Homogeneous Coexistence in café_<1-x>Co_x AsF and Phase Segregation in LaFeAsO_<1-x>F_x Studied via NMR2013

    • Author(s)
      N. Fujiwara, S. Matsuishi, Y. Kamihara, and H. Hosono
    • Journal Title

      J. Supercond. Nov. Magn.

      Volume: 26 Issue: 8 Pages: 2689-2692

    • DOI

      10.1007/s10948-013-2161-0

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Homogeneous Coexistence and Phase Segregation in 1111 Iron-based Pnictides Studied via NMR2013

    • Author(s)
      N. Fujiwara, Y. Kamihara, S. Matsuishi, and H. Hosono
    • Journal Title

      Journal of the Korean Physical Society

      Volume: 62 Pages: 2004-2006

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Homogeneous coexistence and phase segragation in 1111 iron-based pnictides studied via NMR2013

    • Author(s)
      N. Fujiwara, Y. Kamihara, S. Matsuishi and H. Hosono
    • Journal Title

      the Journal of the Korean Physical Society (JKPS)

      Volume: 62 Issue: 12 Pages: 2004-2006

    • DOI

      10.3938/jkps.62.2004

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Homogeneous Coexistence in CaFe1-xCoxAsF and phase Segregation in lafeAsO1-xFx studied via NMR2013

    • Author(s)
      N. Fujiwara, S. Matsuishi, Y. Kamihara, and H. Hosono
    • Journal Title

      J. Supercond. Nov. Magn.

      Volume: 26 Pages: 2689-2692

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electric property of the iron pnictide oxide superconductor (Fe_2As_2)(Ca_6 (Al, Ti)_4O_y) under hydrostatic pressure2012

    • Author(s)
      A. Hisada, N. Fujiwara, Y. Uwatoko, H. Ogino, K. Kishio and J. Shimoyama
    • Journal Title

      Journal of Physics : Conf. Ser

      Volume: 391 Pages: 12126-12126

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Spin density wave and superconductivity in café_<1-x>Co_x AsF studied by nuclear magnetic resonance2012

    • Author(s)
      S. Tsutsumi, N. Fujiwara, S. Matsuishi, and H. Hosono
    • Journal Title

      Phys. Rev. B

      Volume: 86 Issue: 6 Pages: 0605151-4

    • DOI

      10.1103/physrevb.86.060515

    • Related Report
      2013 Final Research Report 2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] ^<75>As NMR study of the growth of paramagnetic domains due to electron doping near the superconducting phase in LaFeAsO_<1-x>F_x2012

    • Author(s)
      N. Fujiwara, T. Nakano, Y. Kamihara, and H. Hosono
    • Journal Title

      Physical Review B

      Volume: 85 Issue: 9 Pages: 945011-5

    • DOI

      10.1103/physrevb.85.094501

    • Related Report
      2013 Final Research Report 2012 Annual Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Successive phase transition from superconducting and spin-density-wave states in (Ca_6(Al, Ti)_4OyFe_2As_2 studied via ^<75>As and ^<27>Al NMR2011

    • Author(s)
      T. Nakano, N. Fujiwara, S. Tsutsumi, H. Ogino, K. Kishio, and J. Shimoyama
    • Journal Title

      Physical Review B

      Volume: 84 Issue: 6

    • DOI

      10.1103/physrevb.84.060502

    • Related Report
      2013 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Homogeneous coexistence of super- conducting and spin-density-wave states in café<1-x>Co_xAsF as seen via nuclear magnetic resonance2011

    • Author(s)
      T. Nakano, S. Tsutsumi, N. Fujiwara, S. Matsuishi, and H. Hosono
    • Journal Title

      Physical Review B

      Volume: 83 Issue: 18 Pages: 1805081-4

    • DOI

      10.1103/physrevb.83.180508

    • Related Report
      2013 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] NMR study under pressure on the La1111 pnictides, LaFeAsO_<1-x> F_x2011

    • Author(s)
      N. Fujiwara, T. Nakano, H. Okada, H. Takahashi,Y. Kamihara, M. Hirano, and H. Hosono
    • Journal Title

      J. Supercond.Nov.Magn.

      Volume: 24 Issue: 3 Pages: 1145-1148

    • DOI

      10.1007/s10948-010-1097-x

    • Related Report
      2013 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Presentation] LaFeAsO_<1-x>H_x のNMRから見た過剰 H ドープ領域の相転移近傍の電子状態2014

    • Author(s)
      藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      東海大学
    • Year and Date
      2014-03-28
    • Related Report
      2013 Final Research Report
  • [Presentation] NMR study of the AF-SC-SC-AF phased transition in a pnictide super- conductor LaFeAsO_<1-x>H_x2014

    • Author(s)
      藤原直樹
    • Organizer
      アメリカ物理学会
    • Place of Presentation
      合衆国デンバー
    • Year and Date
      2014-03-06
    • Related Report
      2013 Final Research Report
  • [Presentation] NMR study of the AF-SC-SC-AF phased transition in a pnictide superconductor LaFeAsO1-xHx2014

    • Author(s)
      藤原直樹
    • Organizer
      アメリカ物理学会
    • Place of Presentation
      合衆国デンバー
    • Related Report
      2013 Annual Research Report
  • [Presentation] LaFeAsO1-xHx のNMRから見た過剰Hドープ領域の相転移近傍の電子状態2014

    • Author(s)
      藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      東海大学
    • Related Report
      2013 Annual Research Report
  • [Presentation] Detection of new AF phase in heavily H-doped LaFeAsO_<1-x>H_x by NMR techniques2013

    • Author(s)
      藤原直樹
    • Organizer
      International Workshop on Novel Superconductors and Super Materials (NS^2 -2013)
    • Place of Presentation
      東京
    • Year and Date
      2013-11-21
    • Related Report
      2013 Final Research Report
  • [Presentation] LaFeAsO_<1-x>H_xのNMR2013

    • Author(s)
      櫻井亮介, 藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      徳島大学
    • Year and Date
      2013-09-27
    • Related Report
      2013 Final Research Report
  • [Presentation] A NiCrAl pressure cell up to 4.6 GPa and its application to cuprate and pnictide superconductors2013

    • Author(s)
      藤原直樹
    • Organizer
      International Association for the Advancement of High Pressure Science and Technology (AIRAPT)2013
    • Place of Presentation
      合衆国 シアトル
    • Year and Date
      2013-07-11
    • Related Report
      2013 Final Research Report
  • [Presentation] NMR study on a pnictide superconductor LaFeAsO_<1-x>H_x in a H- overdoped regime : revival of antiferro- magnetic fluctuations2013

    • Author(s)
      藤原直樹
    • Organizer
      Superstripes 2013
    • Place of Presentation
      イタリア
    • Year and Date
      2013-05-30
    • Related Report
      2013 Final Research Report
  • [Presentation] NMR study of spin fluctuations and superconductivity in LaFeAsO_<1-x>H_x2013

    • Author(s)
      藤原直樹
    • Organizer
      アメリカ物理学会
    • Place of Presentation
      合衆国ボルチモア
    • Year and Date
      2013-03-18
    • Related Report
      2013 Final Research Report
  • [Presentation] NMR study on a pnictide superconductor LaFeAsO1-xHx in a H-overdoped regime: revival of antiferromagnetic fluctuations2013

    • Author(s)
      藤原 直樹
    • Organizer
      Superstripes 2013
    • Place of Presentation
      イタリア イスキア
    • Related Report
      2013 Annual Research Report
  • [Presentation] A NiCrAl pressure cell up to 4.6 GPa and its application to cuprate and pnictide superconductors2013

    • Author(s)
      藤原 直樹
    • Organizer
      AIRAPT 2013
    • Place of Presentation
      合衆国 シアトル
    • Related Report
      2013 Annual Research Report
  • [Presentation] LaFeAsO1-xHx のNMR2013

    • Author(s)
      櫻井亮介
    • Organizer
      日本物理学会
    • Place of Presentation
      徳島大学
    • Related Report
      2013 Annual Research Report
  • [Presentation] NMR study of spin fluctuations and superconductivity in LaFeAsO1-xHx2013

    • Author(s)
      N. Fujiwara
    • Organizer
      APS March Meeting 2013
    • Place of Presentation
      合衆国
    • Related Report
      2012 Annual Research Report
  • [Presentation] 鉄砒素系超伝導体LaFeAsO_<1-x>H_xの^<75>As NMRII2012

    • Author(s)
      櫻井亮介, 藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      2012-09-21
    • Related Report
      2013 Final Research Report
  • [Presentation] Homogeneous coexistence or phase segragation between AF and SC states in iron-based pnictides studied via NMR2012

    • Author(s)
      藤原直樹
    • Organizer
      Superstripes 2012
    • Place of Presentation
      イタリア
    • Year and Date
      2012-07-15
    • Related Report
      2013 Final Research Report
  • [Presentation] Homogeneous coexistence and phase segragation in 1111 iron-based pnictides studied via NMR2012

    • Author(s)
      藤原直樹
    • Organizer
      The international Conference on Magnetism (ICM) 19
    • Place of Presentation
      韓国
    • Year and Date
      2012-07-10
    • Related Report
      2013 Final Research Report
  • [Presentation] 鉄 系 超 伝 導 体LaFeAsO_<1-x>H_x(x=0.2, 0.4) の^<75>As-NMR2012

    • Author(s)
      堤俊二, 藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      関西学院大学
    • Year and Date
      2012-03-25
    • Related Report
      2013 Final Research Report
  • [Presentation] NMR による LaFeAsO_<1-x>F_xの電子相図の再考 : 電子ドープによる常磁性ドメインの発達2012

    • Author(s)
      藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      関西学院大学
    • Year and Date
      2012-03-25
    • Related Report
      2013 Final Research Report
  • [Presentation] NMRによるLaFeAs01-xFxの電子相図の再考:電子ドープによる常磁性ドメインの発達2012

    • Author(s)
      藤原直樹、神原陽一、細野秀雄
    • Organizer
      日本物理学会
    • Place of Presentation
      富山大学
    • Year and Date
      2012-03-25
    • Related Report
      2011 Annual Research Report
  • [Presentation] 鉄系超伝導体LaFeAs01-xHx(x=0.2,0.4)の75As-NMR2012

    • Author(s)
      堤俊二、藤原直樹、飯村壮史、松石聡、細野秀雄
    • Organizer
      日本物理学会
    • Place of Presentation
      富山大学
    • Year and Date
      2012-03-25
    • Related Report
      2011 Annual Research Report
  • [Presentation] 鉄砒素系超伝導体LaFeAsO1-xHxの75As NMR II2012

    • Author(s)
      櫻井亮介、藤原直樹、飯村壮士、松石聡、細野秀雄
    • Organizer
      日本物理学会
    • Place of Presentation
      横浜国立大学
    • Related Report
      2012 Annual Research Report
  • [Presentation] Homogeneous coexistence or phase segragation between AF and SC states in iron-based pnictides studied via NMR2012

    • Author(s)
      N. Fujiwara, Y. Kamihara, S. Matsuishi and H. Hosono
    • Organizer
      Superstripes 2012
    • Place of Presentation
      イタリア
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Homogeneous coexistence and phase segregation in the 1111 iron-based pnictides studied via NMR2012

    • Author(s)
      N. Fujiwara, S. Matsuishi, Y. Kamihara, H. Hosono
    • Organizer
      The international conference on Magnetizm
    • Place of Presentation
      韓国
    • Related Report
      2012 Annual Research Report
  • [Presentation] Co置換型鉄系超伝導体Ca1111系 café_<1-x>Co_xAsF(x=0, 0.06, 0.12, 0.2) の^<75>As-NMR2011

    • Author(s)
      堤俊二, 藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-21
    • Related Report
      2013 Final Research Report
  • [Presentation] 鉄系超伝導体(Fe_2As_2)(Ca_6(Al,Ti)_4 O_y )のNMR2011

    • Author(s)
      藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-21
    • Related Report
      2013 Final Research Report
  • [Presentation] 鉄ニクトタイド超伝導体(Fe_2As_2)(Ca_6(Al,Ti)_4O_y)の圧力効果(2)2011

    • Author(s)
      久田旭彦, 藤原直樹
    • Organizer
      日本物理学会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-21
    • Related Report
      2013 Final Research Report
  • [Presentation] 鉄系超伝導体(Fe2As2)(Ca6(Al,Ti)40y)のNMR2011

    • Author(s)
      藤原直樹、堤俊二、荻野拓、岸尾光二、下山淳一
    • Organizer
      日本物理学会
    • Place of Presentation
      富山大学
    • Year and Date
      2011-09-21
    • Related Report
      2011 Annual Research Report
  • [Presentation] 鉄ニクトタイド超伝導体(Fe2As2)(Ca6(Al,Ti)40y)の圧力効果(2)2011

    • Author(s)
      久田旭彦、藤原直樹、上床美也、荻野拓、岸尾光二、下山淳一
    • Organizer
      日本物理学会
    • Place of Presentation
      富山大学
    • Year and Date
      2011-09-21
    • Related Report
      2011 Annual Research Report
  • [Presentation] Co置換型鉄系超伝導体Ca1111CaFe1-xCoxAsF(x-0,0.06,0.12,0.2)の75AsNMR2011

    • Author(s)
      堤俊二、藤原直樹、松石聡、細野秀雄
    • Organizer
      日本物理学会
    • Place of Presentation
      富山大学
    • Year and Date
      2011-09-21
    • Related Report
      2011 Annual Research Report
  • [Presentation] Homogeneous coexistence of AF and SC states in the 1111 series studied by NMR2011

    • Author(s)
      藤原直樹
    • Organizer
      International Workshop on Novel Superconductors and Super Materials (NS^2 -2011)
    • Place of Presentation
      東京
    • Year and Date
      2011-03-07
    • Related Report
      2013 Final Research Report
  • [Remarks]

    • URL

      http://www.fujiwara.h.kyoto-u.ac.jp/

    • Related Report
      2013 Final Research Report
  • [Remarks] 藤原 直樹 - 京都大学総合人間学部 京都大学大学院人間・環境学研究科

    • URL

      http://www.h.kyoto-u.ac.jp/staff/341_fujiwara_n_0_j.html

    • Related Report
      2012 Annual Research Report
  • [Remarks] 藤原研究室 - 京都大学

    • URL

      http://www.fujiwara.h.kyoto-u.ac.jp/

    • Related Report
      2012 Annual Research Report
  • [Remarks] 藤原 直樹 - 京都大学 教育研究活動データベース

    • URL

      http://kyouindb.iimc.kyoto-u.ac.jp/j/vX4lY

    • Related Report
      2012 Annual Research Report
  • [Remarks]

    • URL

      http://www.fujiwara.h.kyoto-u.ac.jp/Jpaper.html

    • Related Report
      2011 Annual Research Report
  • [Remarks]

    • URL

      http://www.fujiwara.h.kyoto-u.ac.jp/Epaper.html

    • Related Report
      2011 Annual Research Report

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Published: 2011-04-06   Modified: 2020-05-15  

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