10 GPa high pressure NMR study of Fe based high temperature superconductor

• Project/Area Number: 21540351
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Chiba University
• Principal Investigator: KOBORI Yoh 千葉大学, 大学院・理学研究科, 教授 (10153660)
• Co-Investigator(Kenkyū-buntansha): FUKAZAWA Hideto 千葉大学, 大学院・理学研究科, 准教授 (90361443)
• Co-Investigator(Renkei-kenkyūsha): TAKESHITA Nao 産業技術総合研究所, 主任研究員 (60292760)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2009: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 鉄系高温超伝導体 / 高圧実験 / NMR/NQR / BaFe2As2 / KFe2As2 / BaFe_2As_2 / KFe_2As_2 / 電気抵抗測定 / NMR/NQR測定 / NMR / NQR

Research Abstract

NMR/NQR and specific heat measurements of (Ba_<1-x>K_x)Fe_2As_2 were performed using high quality single crystals at ambient and high pressure. The superconducting gap in KFe_2As_2 has a multi- gap structure consisted of large and very small gaps. We found that a larger gap had a line-node structure. NMR study in (Ba_<1-x>K_x)Fe_2As_2 showed that the superconducting gap structure changed very smoothly with increasing x for x > 0.4. The superconductivity appears above 15 GPa in BaFe_2As_2 associated with disappearance of anti-ferromagnetic order. The phase change is extremely sensitive to pressure in homogeneity.

Research Products

• [Journal Article] Potential Antiferromagnetic Fluctuations in Hole-Doped Iron-Pnictide Superconductor Ba_<1-x>K_xFe_2As_2 Studied by <75>^As NuclearMagnetic Resonance Measurement (2012)
  • Author(s): M. Hirano. Y. Yamada. T. Saito. R. Nagashima. T. Konishi. T. Toriyama. Y. Ohta. H. Fukazawa. Y. Kohori. Y. Furukawa. K. Kihou. C.-H. Lee. A. Iyo. H. Eisaki
  • Journal Title: J. Phys. Soc Volume: Jpn. 81
  • Peer Reviewed
• [Journal Article] Potential Antiferromagnetic Fluctuations in Hole-Doped Iron-Pnictide Superconductor Ba_<1-x>K_xFe_2As_2 Studied by ^<75>As Nuclear Magnetic Resonance Measurement (2012)
  • Author(s): M.Hirano, 他13名
  • Journal Title: J.Phys.Soc.Jpn. Volume: 81 Issue: 5 Pages: 054704-054704
  • DOI: 10.1143/jpsj.81.054704
  • Peer Reviewed
• [Journal Article] Pressure and K doping induced superconductivity in BaFe_2As_2 (2011)
  • Author(s): T. Yamazaki. N. Takeshita. R. Kobayashi. T. Saito. Y. Yamada. K. Kondo. M. Hirano. H. Fukazawa. Y. Kohori. K. Kihou. C. H. Lee. H. Kito. A. Iyo H. Eisaki
  • Journal Title: J. Phys.: Conf Volume: Ser.273
  • Peer Reviewed
• [Journal Article] Fast Spin Fluctuation Viewed by Muon Spin Relaxation in Optimally Doped and Overdoped Iron-Based Oxypnictide Superconductors LaFeAsO_<1-x>F_x (2011)
  • Author(s): K. Ohishi. Y. Ishii. K. Miyazawa. H. Fukazawa. I. Watanabe. Y. Kohori. P. M. Shirage. H. Kito. A. Iyo. H. Eisaki
  • Journal Title: J. Phys. Soc Volume: Jpn. 80
  • Peer Reviewed
• [Journal Article] Gap in KFe_2As_2 studied by small-angle neutron scattering observations of the magnetic vortex Lattice (2011)
  • Author(s): H. Kawano-Furukawa. C. J. Bowell. J. S. White. R. W. Heslop. A. S. Cameron. E. M. Forgan. K. Kihou. C. H. Lee. A. Iyo. H. Eisaki. T. Saito. H. Fukazawa. Y. Kohori. R. Cubitt. C. D.Dewhurst. J. L. Gavilano M. Zolliker
  • Journal Title: Phys. Rev Volume: B 84
  • Peer Reviewed
• [Journal Article] Cyclotron Resonance and Mass Enhancement by Electron Correlation in KFe_2As_2 (2011)
  • Author(s): M. Kimata. T. Terashima. N. Kurita .H. Satsukawa. A. Harada. K. Kodama. K. Takehana. Y. Imanaka. T. Takamasu. K. Kihou. Chul-Ho Lee. H. Kito. H. Eisaki. A. Iyo. H. Fukazawa. Y. Kohori. H. Harima S. Uji
  • Journal Title: Phys. Rev Volume: Lett. 107
  • Peer Reviewed
• [Journal Article] Pressure and K doping induced superconductivity in BaFe_2As_2 (2011)
  • Author(s): T.Yamazaki, 他13名
  • Journal Title: J.Phys. : Conf.Ser. Volume: 273 Pages: 012041-012041
  • DOI: 10.1088/1742-6596/215/1/012041
  • Peer Reviewed
• [Journal Article] Fast Spin Fluctuation Viewed by Muon Spin Relaxation in Optimally Doped and Overdoped Iron-Based Oxypnictide Superconductors LaFeAsO_<1-x>F_x (2011)
  • Author(s): K.Ohishi, 他9名
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80 Issue: 2 Pages: 024703-024703
  • DOI: 10.1143/jpsj.80.024703
  • Peer Reviewed
• [Journal Article] Gap in KFe_2As_2 studied by small-angle neutron scattering observations of the magnetic vortex lattice (2011)
  • Author(s): H.Kawano-Furukawa, C.J.Bowell, et al
  • Journal Title: Phys.Rev.B Volume: 84 Issue: 2
  • DOI: 10.1103/physrevb.84.024507
  • Peer Reviewed
• [Journal Article] Cyclotron Resonance and Mass Enhancement by Electron Correlation in KFe_2As_2 (2011)
  • Author(s): M.Kimata, T.Terashima, et al
  • Journal Title: Phys.Eev.Lett. Volume: 107 Issue: 16 Pages: 166402-166402
  • DOI: 10.1103/physrevlett.107.166402
  • Peer Reviewed
• [Journal Article] Incommensurate spin fluctuations in hole-overdoped superconductor KFe2As2 (2011)
  • Author(s): C.H.Lee, 他11名
  • Journal Title: Phys.Rev Lett Volume: 106
  • Peer Reviewed
• [Journal Article] Quasi-Two-Dimensional Fermi Surfaces and Coherent Interlayer Transport in KFe2As2 (2010)
  • Author(s): M.Kimata, 他17名
  • Journal Title: Phys.Rev.Lett. Volume: 105
  • Peer Reviewed
• [Journal Article] Single Crystal Growth and Characterization of the Iron-Based Superconductor KFe2As2 Synthesized by KAs Flux Method (2010)
  • Author(s): K.Kihou, 他11名
  • Journal Title: J.Phys.Soc.Jpn. Volume: 79
  • Peer Reviewed
• [Journal Article] 75As NMR Study of Hole-Doped Iron-Based Superconductor Bal-xKxFe2As2 (2010)
  • Author(s): H.Fukazawa, 他12名
  • Journal Title: Physica C Volume: 470 Pages: 464-465
  • Peer Reviewed
• [Journal Article] Evidence for superconducting gap nodes in the zone centered hole bands of KFe2As2 from magnetic penetration depth measurements (2010)
  • Author(s): K.Hashimoto, 他16名
  • Journal Title: Phys.Rev;B Volume: 82
  • Peer Reviewed
• [Journal Article] Appearance of pressure induced superconductivity in BaFe2As2 under hydrostatic conditions and its extremely high sensitivity to uniaxial stress (2010)
  • Author(s): T.Yamazaki, 他9名
  • Journal Title: Phys.Rev.B Volume: 81
  • Peer Reviewed
• [Journal Article] Fermi Surface and Mass Enhancement in KFe2As2 from deHaas-van Alphen Effect Measurements (2010)
  • Author(s): T.Terashima, 他17名
  • Journal Title: J.Phys.Soc.Jpn. Volume: 79
  • Peer Reviewed
• [Journal Article] Possible multiple gap superconductivity with line nodes in heavily holedoped superconductor KFe_2As_2 studied by ^<75>As nuclear quadrupole resonance and specific heat (2010)
  • Author(s): H.Fukazawa, 他14名
  • Journal Title: J.Phys.Soc.Jpn. 78
  • Peer Reviewed
• [Presentation] 単結晶Ba1-xKxFe2As2(x=0-0.31)の圧力効果II (2012)
  • Author(s): 國分光胤, 小牧泰大, 富沢裕樹, 山崎岳洋, 小林良介, 齊藤拓, 深澤英人, 小堀洋, 竹下直, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-25
• [Presentation] 単結晶Ba_<1-x>K_xFe_2As_2のK高濃度領域の<75>^As-NMR/NQR II (2012)
  • Author(s): 長澤洋平, 平野将記, 山田佑自, 齊藤拓, 長島亮, 深澤英人, 小堀洋, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-25
• [Presentation] 単結晶Ba1-xKxFe2As2のK高濃度領域の75As-NMR/NQR II (2012)
  • Author(s): 長澤洋平, 他10名
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-25
• [Presentation] 重い電子系化合物Ce_2PdIn_8の<115>^In-NQRによる研究II (2012)
  • Author(s): 長島亮, 島谷奨, 深澤英人, 小堀洋, D. Kaczorowski
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-24
• [Presentation] 重い電子系化合物Ce2PdIn8の115In-NQRによる研究II (2012)
  • Author(s): 長島亮, 他4名
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-24
• [Presentation] 重い電子系化合物Ce_2PdIn_8の<115>^In-NQRによる研究 (2011)
  • Author(s): 長島亮, 深澤英人, 小堀洋, D. Kaczorowski
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-25
• [Presentation] 重い電子系化合物Ce2PdIn8の115In-NQRによる研究 (2011)
  • Author(s): 長島亮, 他3名
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-25
• [Presentation] Ba_<1-x>K_xFe_2As_2(x=0.27-1)の<75>^As-NMR/NQR (2011)
  • Author(s): 平野将記, 山田佑自, 齊藤拓, 村野悠一郎, 長島亮, 深澤英人, 小堀洋, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-22
• [Presentation] Ba1-xKxFe2As2(x=0.27-1)の75As-NMR/NQR (2011)
  • Author(s): 平野将記, 他10名
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-22
• [Presentation] NMR study of hole-doped iron-pnictide superconductor Ba_<(1-x)>K_xFe_2As_2(x = 0.27-1) (2011)
  • Author(s): M. Hirano. Y. Yamada. T. Saito. Y. Murano. R. Nagashima. H. Fukazawa. Y. Kohori. K. Kihou. C. H. Lee. A. Iyo. H. Eisaki
  • Organizer: 26th International Conference on Low Temperature Physics(LT26)
  • Place of Presentation: 北京
  • Year and Date: 2011-08-16
• [Presentation] NMR study of hole-doped iron-pnictide superconductor Ba(1-x)KxFe2As2 (x=0.27-1) (2011)
  • Author(s): M.Hirano, 他10名
  • Organizer: 26th International Conference on Low Temperature Physics (LT26)
  • Place of Presentation: 北京
  • Year and Date: 2011-08-16
• [Presentation] 単結晶KFe2As2の75As-NMR/NQR II (2010)
  • Author(s): 山田佑自, 他10名
  • Organizer: 日本物理学会2010年度秋季大会
  • Place of Presentation: 大阪府立大学・中百舌鳥キヤンパス
  • Year and Date: 2010-09-24
• [Presentation] 鉄系超伝導体KFe2As2の低温比熱測定 (2010)
  • Author(s): 出口和彦, 他12名
  • Organizer: 日本物理学会2010年度秋季大会
  • Place of Presentation: 大阪府立大学・中百舌鳥キヤンハス
  • Year and Date: 2010-09-23
• [Presentation] 単結晶Ba1-xKxFe2As2の75As・NMR III (2010)
  • Author(s): 平野将記, 他10名
  • Organizer: 日本物理学会平成2010年度秋季大会
  • Place of Presentation: 大阪府立大学・中百舌鳥キヤンパス
  • Year and Date: 2010-09-23
• [Presentation] 単結晶Kfe_2As_2の^<75>As-NMR/NQR (2010)
  • Author(s): 山田佑自, 他10名
  • Organizer: 日本物理学会第65年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-22
• [Presentation] 単結晶GdRu_4P_<12>の^<101>Ru-NQR (2010)
  • Author(s): 深澤英人, 他7名
  • Organizer: 日本物理学会第65年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-21
• [Presentation] 単結晶Ba_<1-x>K_xFe_2As_2の^<75>As-NMRII (2010)
  • Author(s): 近藤健二, 他9名
  • Organizer: 日本物理学会第65年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-20
• [Presentation] KFe_2As_2の単結晶育成とその物性 (2010)
  • Author(s): 齊藤拓, 他10名
  • Organizer: 日本物理学会第65年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-20
• [Presentation] 単結晶BaFe_2As_2の圧力効果II (2010)
  • Author(s): 小林良介, 他9名
  • Organizer: 日本物理学会第65年次大会
  • Place of Presentation: 岡山大学津島キャンパス
  • Year and Date: 2010-03-20
• [Presentation] 単結晶BaFe_2As_2の圧力効果 (2009)
  • Author(s): 山崎岳洋, 他9名
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学黒髪キャンパス
  • Year and Date: 2009-09-28
• [Presentation] KFe_2As_2の比熱及び^<75>As-NQR (2009)
  • Author(s): 山田佑自, 他12名
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学黒髪キャンパス
  • Year and Date: 2009-09-27
• [Presentation] 単結晶Ba_<1-x>K_xFe_2As_2の^<75>As-NMR (2009)
  • Author(s): 近藤健二, 他9名
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学黒髪キャンパス
  • Year and Date: 2009-09-26
• [Presentation] CaFe_2As_2の一軸圧力効果 (2009)
  • Author(s): 齊藤拓, 他8名
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学黒髪キャンパス
  • Year and Date: 2009-09-26
• [Presentation] ^<75>As NMR Study of Hole-doped Iron-based Superconductor Ba_<1-x>K_xFe_2As_2 (2009)
  • Author(s): 深澤英人, 他12名
  • Organizer: 9th International Conference on Materials and Mechanisms of Superconductivity
  • Place of Presentation: 京王プラザホテル、新宿
  • Year and Date: 2009-09-09
• [Presentation] Pressure Dependence of Magnetic and Superconducting Properties in Afe_2As_2 (A=Ca, and K) (2009)
  • Author(s): 小堀洋, 他11名
  • Organizer: 9th International Conference on Materials and Mechanisms of Superconductivity
  • Place of Presentation: 京王プラザホテル、新宿
  • Year and Date: 2009-09-09
• [Presentation] Robust Superconductivity under High Pressure in Ba_<0.6>K_<0.4>Fe_2As_2 (2009)
  • Author(s): 竹下直, 他9名
  • Organizer: 9th International Conference on Materials and Mechanisms of Superconductivity
  • Place of Presentation: 京王プラザホテル、新宿
  • Year and Date: 2009-09-09
• [Presentation] De Haas-van Alphen Oscillations in KFe_2As_2 (2009)
  • Author(s): 小堀洋, 他14名
  • Organizer: 9th International Conference on Materials and Mechanisms of Superconductivity
  • Place of Presentation: 京王プラザホテル、新宿
  • Year and Date: 2009-09-09
• [Presentation] Development of Nuclear Magnetic and Quadrupole Resonance Spectroscopy under 10GPa Class Pressure (2009)
  • Author(s): 小林良介, 他6名
  • Organizer: International Conference on High Pressure Science and Technology
  • Place of Presentation: 東京国際交流館、台場
  • Year and Date: 2009-07-29
• [Presentation] ^<75>As-NMR study of the iron pnictide Ba_<1-x>K_xFe_2As_2 under High Pressure (2009)
  • Author(s): 山崎岳洋, 他11名
  • Organizer: International Conference on High Pressure Science and Technology
  • Place of Presentation: 東京国際交流館、台場
  • Year and Date: 2009-07-28