NMR study of unconventional superconductivity in strongly correlated electron systems

• Project/Area Number: 22740232
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Okayama University
• Principal Investigator: KAWASAKI Shinji 岡山大学, 大学院・自然科学研究科, 講師 (80397645)
• Co-Investigator(Renkei-kenkyūsha): ZHENG Guo-qing 岡山大学, 大学院・自然科学研究科, 教授 (50231444)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2010: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 電子相関 / 異方的超伝導 / 核磁気共鳴 / 低温 / 強磁場 / 銅酸化物 / 鉄砒化物 / 強相関電子系 / 量子臨界点 / 高温超伝導 / 擬ギャップ / 高圧

Research Abstract

1. NMR study of high-Tccuprate in very high magnetic field; by applying high magnetic field of 45 T, we revealed the pseudogap ground state for high Tc cuprate after suppressing superconductivity for the first time.
2. NMR study of magnetism and superconductivity in iron-pnictide superconductors; we found the phase diagram of iron-pnictide superconductor is similar with high-Tccuprate indicating that magnetism helps to raise Tcin iron-pnictide as well as cuprate.

Research Products

• [Journal Article] The MottState and Superconductivity in Face-Centred Cubic Structured Cs3C60: A 133Cs-Nuclear Magnetic Resonance Study under Pressure (2013)
  • Author(s): 川崎慎司 他6名
  • Journal Title: J. Phys. Soc. Jpn Volume: Vol.82 Issue: 1 Pages: 014709-014709
  • DOI: 10.7566/jpsj.82.014709
  • Peer Reviewed
• [Journal Article] Luttinger-volume violating Fermi liquid in the pseudogap phase of the cuprate superconductors (2012)
  • Author(s): Jia-Wai Mei、川崎慎司、他3名
  • Journal Title: Phys. Rev. B Volume: Vol. 85 Issue: 13
  • DOI: 10.1103/physrevb.85.134519
  • Peer Reviewed
• [Journal Article] Antiferromagnetic Spin Fluctuations above the Dome-Shaped and Full-Gap Superconducting States of LaFeAsO_<1-x>F_x Revealed by ^<75>As-Nuclear Quadrupole Resonance (2012)
  • Author(s): T.Oka
  • Journal Title: Phys.Rev.Lett. Volume: 108 Issue: 4
  • DOI: 10.1103/physrevlett.108.047001
  • Peer Reviewed
• [Journal Article] Cu-NMR Study of Bi2Sr1.6La0.4CuO6+δ Superconductor in Very High Magnetic Fields (2012)
  • Author(s): Shinji Kawasaki
  • Journal Title: J. Phys.: Conf. Series Volume: 400 Issue: 2 Pages: 022052-022052
  • DOI: 10.1088/1742-6596/400/2/022052
  • Peer Reviewed
• [Journal Article] Pseudogap Ground State and Its Doping Evolution in Bi2Sr2-xLaxCuO6+δ: Removing the Superconducting State by the Application of Very High Magnetic Fields (2012)
  • Author(s): G.-q.Zheng
  • Journal Title: J. Supercond. Nov. Magn. Volume: 25 Issue: 5 Pages: 1249-1253
  • DOI: 10.1007/s10948-012-1575-4
  • Peer Reviewed
• [Journal Article] As-NMR/NQR study of pressure-induced superconductivity in CaFe2As2 (2011)
  • Author(s): S.Kawasaki
  • Journal Title: Journal of Physics and Chemistry of Solids Volume: 72 Issue: 5 Pages: 501-501
  • DOI: 10.1016/j.jpcs.2010.10.010
  • Peer Reviewed
• [Journal Article] As-NQR study of superconductivity in LaRAsO_<1-x>F_x (R=Fe and Ni) (2011)
  • Author(s): 岡利英、田渕貴久、李政、川崎慎司, 他計8名
  • Journal Title: J.Phys.Chem.Solids. Volume: 72 Issue: 5 Pages: 497-500
  • DOI: 10.1016/j.jpcs.2010.10.022
  • Peer Reviewed
• [Journal Article] Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides : Comparison with nickel analog (2011)
  • Author(s): 李政、川崎慎司, 他計15名
  • Journal Title: J.Phys.Chem.Solids. Volume: 72 Issue: 5 Pages: 492-496
  • DOI: 10.1016/j.jpcs.2010.10.038
  • Peer Reviewed
• [Journal Article] As-NMR/NQR study of CaFe_2As_2 under pressure (2011)
  • Author(s): 川崎慎司, 他計6名
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80 Issue: Suppl.A Pages: SA116-SA116
  • DOI: 10.1143/jpsjs.80sa.sa116
  • Peer Reviewed
• [Journal Article] Carrier-Concentration Dependence of the Pseudogap Ground State of Superconducting Bi2Sr2-xLaxCuO6+δRevealed by 63,65Cu-Nuclear Magnetic Resonance in Very High Magnetic Fields (2010)
  • Author(s): 川崎慎司、他5名
  • Journal Title: Phys. Rev. Lett Volume: Vol.105 Issue: 13
  • DOI: 10.1103/physrevlett.105.137002
  • Peer Reviewed
• [Journal Article] Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2 (2010)
  • Author(s): 川崎慎司、他4名
  • Journal Title: Supercond. Sci. Technol Volume: Vol. 23 Issue: 5 Pages: 054004-054004
  • DOI: 10.1088/0953-2048/23/5/054004
  • Peer Reviewed
• [Journal Article] Evidence for a full energy gap for nickel-pnictide LaNiAsO_<1-x>F_x superconductors by ^<75>As nuclear quadrupole resonance (2010)
  • Author(s): 田渕貴久
  • Journal Title: Physical Review B Volume: 81
  • Peer Reviewed
• [Journal Article] Pressure-induced unconventional superconductivity near a quantum critical point in CaFe_2As_2 (2010)
  • Author(s): 川崎慎司
  • Journal Title: Supercond.Sci.Technol. Volume: 23
  • Peer Reviewed
• [Journal Article] Carrier-Concentration Dependence of the Pseudogap Ground State of Superconducting Br_2Sr_<2-x>La_xCuO_<5+δ> Revealed by ^<63,65>Cu-Nuclear Magnetic Resonance in Very High Magnetic Fields (2010)
  • Author(s): 川崎慎司
  • Journal Title: Physical Review Letters Volume: 105
  • Peer Reviewed
• [Presentation] NMR/NQR study of high-Tccuprate and iron pnictide (2012)
  • Author(s): 川崎慎司
  • Organizer: International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials
  • Place of Presentation: Okayama University
  • Year and Date: 2012-10-02
• [Presentation] 量子臨界点由来の新奇超伝導相の核磁気共鳴法による研究、領域6,8合同シンポジウム「奇周波数クーパー対の物理」 (2012)
  • Author(s): 川崎慎司
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学西宮上ケ原キャンパス
  • Year and Date: 2012-03-25
• [Presentation] NMR/NQR study of high-Tc cuprate and iron pnictide (2012)
  • Author(s): Shinji Kawasaki
  • Organizer: International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials
  • Place of Presentation: 岡山大学津島キャンパス
  • Invited
• [Presentation] 擬ギャップの基底状態とそのドーピング依存性:超強磁場下NMR、領域 8シンポジウム「高温超伝導体研究の最近の進展:波数空間と実空間プローブから探る擬ギャップと超伝導ギャップの関係」 (2011)
  • Author(s): 川崎慎司
  • Organizer: 日本物理学会 2011 年秋季大会
  • Place of Presentation: 富山大学五福キャンパス
  • Year and Date: 2011-09-23
• [Presentation] 擬ギャップの基底状態とそのドーピング依存性:超強磁場下NMR (2011)
  • Author(s): 川崎慎司
  • Organizer: 日本物理学会2011年秋季大会領域8シンポジウム「高温超伝導体研究の最近の進展:波数空間と実空間プローブから探る擬ギャップと超伝導ギャップの関係」
  • Place of Presentation: 富山大学五福キャンパス(招待講演)
  • Year and Date: 2011-09-23
• [Presentation] Cu-NMR Study of Bi2Sr2-xLaxCuO6+ δ Superconductor in Very High Magnetic Fields (2011)
  • Author(s): 川崎慎司、他4名
  • Organizer: 26th International Conference on Low Temperature Physics (LT26)
  • Place of Presentation: 中国北京市
  • Year and Date: 2011-08-12
• [Presentation] Cu-NMR Study of Bi_2Sr_<2-x>La_xCuO_<6+δ> Superconductor in Very High Magnetic Fields (2011)
  • Author(s): 川崎慎司
  • Organizer: 26th International Conference on Low Temperature Physics (LT26)
  • Place of Presentation: 中国北京市国際会議センター
  • Year and Date: 2011-08-12
• [Presentation] CaFe2As2 の圧力下As-NMR/NQRによる研究 (2010)
  • Author(s): 川崎慎司、他 5 名
  • Organizer: 日本物理学会 2010年秋季大会
  • Place of Presentation: 大阪府立大学中百舌鳥キャンパス
  • Year and Date: 2010-09-24
• [Presentation] CaFe_2As_2の圧力下As-NMR/NQRによる研究 (2010)
  • Author(s): 川崎慎司
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-24
• [Presentation] As-NMR/NQR study of CaFe_2As_2 under pressure (2010)
  • Author(s): 川崎慎司
  • Organizer: International Conference on Heavy Electrons 2010 (ICHE2010)
  • Place of Presentation: 首都大学東京
  • Year and Date: 2010-09-18
• [Presentation] As-NMR/NQR Study of Pressure-Induced Superconductivity in CaFe_2As_2 (2010)
  • Author(s): 川崎慎司
  • Organizer: The 9th International Conference on Spectroscopies in Novel Superconductors (SNS2010)
  • Place of Presentation: 上海市fudan大学
  • Year and Date: 2010-05-27
• [Presentation] PG基底状態
  • Author(s): 川崎慎司
  • Organizer: 高温超伝導フォーラムキックオフミーティング
  • Place of Presentation: 広島大学東広島キャンパス
• [Remarks] 雑誌論文(4)に関しては、岡山大学広報を通じて、平成22年9月30日に記者発表を行った。その結果、山陽新聞朝刊(平成22年10月1日付)、日経産業新聞(平成22年10月3日付)、科学新聞1面(平成22年10月8日付)に記事が掲載された。また、共同通信社を通じて記事が全国に配信された。同時に山陽放送(RSK)の夕方(平成22年10月1日)のニュースやNHK岡山放送局の朝のニュース(平成22年11月8日)でもニュース動画が放映されるなど、大きく取り上げられた。
• [Remarks] また、雑誌論文(3)に関しては、平成24年1月12日に記者発表を行った結果、山陽新聞朝刊(平成24年1月17日付)および日経産業新聞(平成24年1月17日付)に掲載された。
• [Remarks]
  • URL: http://www.physics.okayama-u.ac.jp/zheng_homepage/