Diamagnetic Precursor State in High-Tc Oxide Superconductors near Optimal Doping Using Scanning Superconducting Quantum Interference Device Microscopy.

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  • Sugimoto Akira
    Department of Physics and CREST-JST, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551, Japan
  • Iguchi Ienari
    Department of Physics and CREST-JST, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551, Japan
  • Miyake Takashi
    Department of Physics and CREST-JST, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551, Japan
  • Sato Hisashi
    NTT Basic Research Laboratories, 3-1 Morinosato Wakamiya, Atsugi 243-0198, Japan

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Magnetic images of high-Tc La1.85Sr0.15CuO4 (LSCO) and YBa2Cu3O7-y (YBCO) thin films near optimal doping observed by scanning superconducting quantum interference device (SQUID) microscopy are presented in the temperature range both below and above the transition temperature Tc. While the quantized vortices were observable below Tc, local diamagnetic domains that led to the Meissner state were found in the narrow limited temperature range above Tc. The result provides evidence that local diamagnetic domains are closely related to the pseudogap state and the d-wave superconductivity.

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