Two-Dimensional Fluctuations Close to the Zero-Field Transition of Bi2Sr2CaCu2O8
J. Kötzler, M. Kaufmann
Abstract
The ac-conductivity along the CuO2-layers of epitaxial films and single crystals of thicknesses 0.2μm≤ Lz ≤130μm reveals clear signatures for 2D-ordering. In particular, at Tc the screening length assumes the universal value LzΛTc/2νs 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 105 CuO2-layers. Several details of the order-parameter dynamics remain unexplained.
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