Lock-in Phenomena of Josephson Vortices under Vicinal Layer Parallel Magnetic Field

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  • Hatano Takeshi
    Nanomaterials Laboratory, National Institute for Materials Science Tokyo University of Science
  • Kim Sunmi
    Nanomaterials Laboratory, National Institute for Materials Science
  • Urayama Shinya
    Nanomaterials Laboratory, National Institute for Materials Science Tokyo University of Science
  • Wang Huabing
    Nanomaterials Laboratory, National Institute for Materials Science
  • Inomata Kunihiro
    Nanomaterials Laboratory, National Institute for Materials Science Research Institute of Electrical Communications, Tohoku University
  • Nagao Masanori
    Nanomaterials Laboratory, National Institute for Materials Science
  • Yun Kyungsung
    Nanomaterials Laboratory, National Institute for Materials Science
  • Kawae Takeshi
    Nanomaterials Laboratory, National Institute for Materials Science
  • Takano Yoshihiko
    Nanomaterials Laboratory, National Institute for Materials Science
  • Tachiki Masashi
    Nanomaterials Laboratory, National Institute for Materials Science
  • Yamashita Tsutomu
    Nanomaterials Laboratory, National Institute for Materials Science

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Description

The lock-in phenomena of Josephson vortices have been studied under the vicinal layer parallel magnetic field in a field cooling experiment. As a sign of the lock-in state, Josephson vortex-flow voltage was measured with c-axis bias current in an in-line type intrinsic Josephson junction formed on a single-crystal Bi2Sr2CaCu2O8+δ superconductor. On cooling, vortex-flow voltage appears at the lock-in transition of the vortices which takes place at the temperature T when the lower critical field Hc1(T) grows as high as the c-axis component of the magnetic field. This can be understood as the pancake vortices being expelled from the superconducting double CuO2 layers by the Meissner effect. The temperature dependence of Hc1(T) was observed by the lock-in transition at various offset angles.

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