VUV laser angular-resolved-photoemission spectroscopy on high-T, superconductors

• Project/Area Number: 19740198
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: ISHIZAKA Kyoko The University of Tokyo, 物性研究所, 助教 (20376651)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,690,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥390,000); Fiscal Year 2008: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2007: ¥2,000,000 (Direct Cost: ¥2,000,000)
• Keywords: 高温超伝導 / 光電子分光 / 強相関電子系 / レーザー / 物性実験

Research Abstract

真空紫外レーザー超高分解能光電子分光装置を用いて、高温超伝導銅酸化物の研究を行った。自然幅の小さいレーザーを用いることでこれまで報告された中で最も明瞭で鋭いスペクトルを得ることに成功し、超伝導ギャップのゼロ点(ノード)近傍の電子構造やキャリア特性を明らかにした。また、表面金属状態が強く内部の超伝導状態を覆い隠してしまうため従来光電子分光が困難だったYBa_2Cu_3O_<7-δ>系において、バルク敏感性を活かし、超伝導状態の直接観測に成功した。

Research Products

• [Journal Article] Superconducting electronic state in optimally doped YBa_2Cu_3O_<7-δ> observed with laser-excited angle-resolved photoemission spectroscopy (2009)
  • Author(s): M. Okawa, K. Ishizaka, H. Uchiyama, H. Tadatomo, T. Masui, S. Tajima, X.-Y. Wangm C.-T. Chen, S. Watanabe, A. Chainani, T. Saitoh, S. Shin
  • Journal Title: Physical Review B 79
  • Peer Reviewed
• [Journal Article] Superconducting electronic state in optimally doped YBa_2Cu_3O_<7-δ> observed with laser-excited angle-resolved photoemission spectroscopy (2009)
  • Author(s): 大川万里生
  • Journal Title: Physical Review B 79((印刷中)掲載確定)
  • Peer Reviewed
• [Journal Article] Strong mass renormalization at a local momentum space in multiorbital Ca_<1.8>Sr_<0.2>RuO_4 (2009)
  • Author(s): 下山田篤志
  • Journal Title: Physical Review Letters 102
  • Peer Reviewed
• [Journal Article] Doping dependence of nodal quasiparticles properties in high-Tc cuprates studied by laser-excited angular-resolved photoemission spectroscopy (2008)
  • Author(s): K. Ishizaka, T. Kiss, S. Izumi, M. Okawa, T. Shimojima, A. Chainani, T. Togashi, S. Watanabe, C.-T. Chen, X. Y. Wang, T. Mochiku, T. Nakane, K. Hirata, S. Shin
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] A versatile system for ultrahigh resolution, low temperature, and polarization dependent laser angle-resolved photoemission spectroscopy (2008)
  • Author(s): T. Kiss, T. Shimojima, K. Ishizaka. A. Chainani, T. Togashi, T. Kanai, X.-Y. Wang, C.-T. Chen, S. Watanabe, S. Shin
  • Journal Title: Review of Scientific Instruments 79
  • Peer Reviewed
• [Journal Article] Temperature-Dependent Localized Excitations of Doped Carriers in Superconducting Diamond (2008)
  • Author(s): 石坂香子
  • Journal Title: Physical Review Letters 100
  • Peer Reviewed
• [Journal Article] Doping-dependence of nodal quasiparticle properties in hihg-T_c cuqrates studied by laser-excited angle-resolved photoemission spectroscopy (2008)
  • Author(s): 石坂 香子
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] A versatile system for ultrahigh resolution, low temperature, endent Laser-angle-resolved photoemission spectroscopy (2008)
  • Author(s): 木須 孝幸
  • Journal Title: Review of Scientific Instruments 79
  • Peer Reviewed
• [Journal Article] Bulk electronic structure of the antiferromagnetic superconducting phase in ErNi_2B_2C (2008)
  • Author(s): 馬場 輝久
  • Journal Title: Physical Review Letters 100
  • Peer Reviewed
• [Journal Article] Interplay of superconductivity and rattling phenomena in β-pyrochlore KOs_2O_6 studied by photoemission spectroscopy (2007)
  • Author(s): 下志万 貴博
  • Journal Title: Physical Review Letters 99
  • Peer Reviewed
• [Presentation] 超高分解能レーザー光電子分光による固体電子物性の研究 (2009)
  • Author(s): 石坂香子
  • Organizer: 第22回日本放射光学会年会・放射光科学合同シンポジウム
  • Place of Presentation: 東京大学本郷キャンパス
  • Year and Date: 2009-01-12
• [Presentation] YBa_2Cu_3O_<7-δ>におけるバルク電子構造の温度依存性 : レーザー励起角度分解光電子分光による測定 (2008)
  • Author(s): 大川万里生, 石坂香子, 以下11名
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学上田キャンパス
  • Year and Date: 2008-09-20
• [Presentation] 高温超伝導体Bi2212におけるノード準粒子の温度依存性 (2007)
  • Author(s): 石坂香子, 以下10名
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学札幌キャンパス
  • Year and Date: 2007-09-21
• [Presentation] YBa_2Cu_3O<7-δ>のレーザー励起角度分解光電子分光 (2007)
  • Author(s): 大川万里生, 石坂香子, 以下9名
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学札幌キャンパス
  • Year and Date: 2007-09-21
• [Presentation] 高温超伝導体Bi_2Sr_2CaCu_2O_8+δにおけるノード準粒子の温度依存性 (2007)
  • Author(s): 石坂 香子
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学札幌キャンパス
  • Year and Date: 2007-09-21
• [Presentation] YBa_2CU_3O_7-δのレーザー励起角度分解光電子分光 (2007)
  • Author(s): 大川 万里生
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学札幌キャンパス
  • Year and Date: 2007-09-21
• [Presentation] VUV laser-excited photoemission spectroscopy on superconducting B-doped diamond (2007)
  • Author(s): 石坂 香子
  • Organizer: The 8th International Conference on Spectroscopies in Novel Superconductors
  • Place of Presentation: 仙台国際センター(宮城県)
  • Year and Date: 2007-08-21
• [Presentation] VUV laser-excited angle-resolved photoemission study on the superconducting state in YBa_2Cu_3O_<7-δ> (2007)
  • Author(s): 大川万里生, 石坂香子, 以下9名
  • Organizer: The 15th International Conference on Vacuum Ultraviolet Radiation Physics
  • Place of Presentation: ドイツベルリン
  • Year and Date: 2007-07-30
• [Presentation] VUV laser-excited angle-resolved photoemission study on the superconducting state in YBa_2Cu_3O_7-δ (2007)
  • Author(s): 大川 万里生
  • Organizer: The 15th International Conference on Vacuum Ultraviolet Radiation Physics
  • Place of Presentation: ドイツ ベルリンGendarmenmarkt Konzerthaus
  • Year and Date: 2007-07-30