Dimensionality and Irreversibility Field in YBa_2Cu_3O_7 Films(High Field Superconductors)
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概要
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In order to investigate the relationship between the flux pinning and dimensionality, the critical current density J_c for YBa_2Cu_3O_7 films was measured as a function of temperature, field and tilt angle between field and c-axis. The kink anomaly in the temperature dependence of J_c for B⊥c was observed as the dimensional crossover from 3D extrinsic pinning to 2D intrinsic pinning. The irreversibility field B_i for B//c was measured in fields up to 23T and estimated to be 90T at 30K using the scaling law of the pinning force densities. The enhancement of B_i from a power law (1-T/T_c)^n with n⋍1.5 for B//c was observed below 40K. This suggests the formation of the 2-dimensional pancake vortex in YBa_2Cu_3O_7.intrinsic pinningirreversibility fieldcritical current densityYBa_2Cu_3O_7 filmdimensional crossover
- 東北大学の論文
- 1996-07-15
著者
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WATANABE K.
Institute for Materials Research, Tohoku University
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AWAJI S.
Institute for Materials Research, Tohoku University
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Kobayashi N.
Institute for Materials Research, Tohoku University
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Yamane H.
Institute for Materials Research, Tohoku University
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Hirai T.
Institute for Materials Research, Tohoku University
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Awaji S
High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi
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