Studies on superconducting gap of high-temperature superconductors

2010 Fiscal Year Self-evaluation Report

• Project/Area Number: 20244060
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: The Institute of Physical and Chemical Research
• Principal Investigator: HANAGURI Tetsuo The Institute of Physical and Chemical Research, 高木磁性研究室, 専任研究員 (40251326)
• Project Period (FY): 2008 – 2011
• Keywords: 走査プローブ顕微鏡 / 超伝導材料・素子 / 超精密計測 / 低温物性

Research Abstract

本研究は、走査型トンネル顕微鏡を用いて、銅酸化物高温超伝導体の超伝導ギャップの特徴を実験的に明らかにすることを目的とする。特に、分光イメージングを幅広いドーピング、磁場、温度範囲で行い、超伝導と共存/競合すると考えられている擬ギャップ状態における種々の電子秩序、電子超構造の生成過程と、超伝導ギャップとの関係を解明する。
また、銅酸化物研究で培った分光イメージングの技術を、最近発見された鉄系超伝導体に適用し、超伝導ギャップ構造の特徴を探る。得られたデータから銅酸化物と鉄系超伝導体の類似点、相違点を明らかにし、両系の超伝導発現機構に関して考察を行う。

Research Products

• [Journal Article] 超伝導体を探る針～分光イメージング走査型トンネル顕微鏡～ (2011)
  • Author(s): 花栗哲郎
  • Journal Title: 日本物理学会誌 66 No.3 Pages: 186-194
  • Peer Reviewed
• [Journal Article] Unconventional s-Wave Superconductivity in Fe(Se,Te) (2010)
  • Author(s): T. Hanaguri, S.Niitaka, K.Kuroki, H.Takagi
  • Journal Title: Science 328 Pages: 474-476
  • Peer Reviewed
• [Journal Article] Coherence Factors in a High-Tc Cuprate Probed by Quasi-particle Scattering off Vortices (2009)
  • Author(s): 花栗哲郎, Y.Kohsaka, M.Ono, M.Maltseva, P.Coleman, I.Yamada, M.Azuma, M.Takano, K.Ohishi, H.Takagi
  • Journal Title: Science 323 Pages: 923-926
  • Peer Reviewed
• [Journal Article] STM で見る高温超伝導体の渦芯 (2008)
  • Author(s): 花栗哲郎
  • Journal Title: パリティ 23 No.10 Pages: 50-54
  • Peer Reviewed
• [Journal Article] How Cooper pairs vanish approaching the Mott insulator in Bi_2Sr_2CaCu_2O_<8+δ> (2008)
  • Author(s): Y.Kohsaka, C.Taylor, P.Wahl, A.Schmidt, Jhinhwan Lee, K.Fujita, J.W.Alldredge, K.McElroy, Jinho Lee, H.Eisaki, S.Uchida, D.-H.Lee, J.C.Davis
  • Journal Title: Nature 454 Pages: 1072-1078
  • Peer Reviewed
• [Presentation] STM/STS studies of the superconducting gap in iron-based superconductors (2011)
  • Author(s): T.Hanaguri
  • Organizer: Aspen Winter Conference"Contrasting Superconductivity of Pnictides and Cuprates"
  • Year and Date: 20110122-20110128
• [Presentation] Spectroscopic-Imaging Scanning Tunneling Microscopy on Iron-Based Superconductors (2010)
  • Author(s): T.Hanaguri
  • Organizer: The 9th International Conference on Spectroscopies in Novel Superconductors
  • Place of Presentation: Shanghai, China.
  • Year and Date: 20100524-20100528
• [Presentation] Emergence of local broken symmetries with hole-doping in Ca_<2-x>Na_xCuO_2Cl_2 (2010)
  • Author(s): Y.Kohsaka
  • Organizer: The 9th International Conference on Spectroscopies in Novel Superconductors
  • Place of Presentation: Shanghai, China.
  • Year and Date: 20100524-20100528
• [Presentation] Phase-sensitive quasi-particle interference effects in high-Tc superconductors (2009)
  • Author(s): T.Hanaguri
  • Organizer: 9th International Conference on Materials and Mechanisms of Superconductivity (M2S-IX)
  • Place of Presentation: Tokyo, Japan.
  • Year and Date: 20090907-20090912
• [Presentation] Magnetic-field effects on the quasi-particle interference in cuprates (2009)
  • Author(s): T.Hanaguri
  • Organizer: Gordon Research Conference on Superconductivity
  • Place of Presentation: Hong Kong, China.
  • Year and Date: 20090607-20090612