Abstract
We present measurements of c-axis transport in single-crystal Bi 2Sr 2CaCu 2O 8 which suggest that decoupling of the superconducting CuO 2 layers occurs via a continuous crossover in this material. We discuss the process of decoupling and supplement our arguments with Monte Carlo simulations of the vortex fluctuations. Our data suggest two regimes in the coupling process. The first is the establishment of a macroscopic correlation length in the c-direction associated with a sharp drop in the c-axis resistivity. The second stage is the establishment of a finite critical current in the c-axis direction which spans the rest of the temperature range down to the irreversibility/melting line.
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