Two-dimensional fluctuations close to the zero-field transition of Bi2Sr2CaCu2O8

Article

关键词: VORTEX-GLASS TRANSITION;    THIN SUPERCONDUCTORS;    PHASE-TRANSITION;    MAGNETIC-FIELD;    FLUX NOISE;    FILMS;    YBA2CU3O7-DELTA;    VORTICES;    CONDUCTIVITY;    THICKNESS;   

DOI  :  10.1103/PhysRevB.56.13734

来源: SCIE

【 摘 要 】

The ac conductivity along the CuO2 layers of epitaxial films and single crystals of thicknesses 0.2 mu m less than or equal to L-z less than or equal to 130 mu m reveals clear signatures for two-dimensional ordering. In particular, at T-c the screening length assumes the universal value L-z Lambda(Tc)/2 nu(s) predicted by the Kosterlitz-Thouless theory, which indicates that binding of long vortex strings nucleates long-range superconductivity in the present samples containing up to 10(5) CuO2 layers. Several details of the order-parameter dynamics remain unexplained.

【 授权许可】

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