Abstract
The Josephson vortex lattice state of the highly anisotropic high- T c superconductor Bi 2Sr 2CaCu 2O 8 has been probed by measurements of the out-of-plane ( c-axis) resistivity as a function of temperature, current density, magnetic field strength H and magnetic field orientation angle θ. Anomalous dissipation is observed below a critical temperature identified as the melting transition of the Josephson vortex lattice. The critical T- H and T- θ phase boundaries are determined. The melting transition is interpreted as a Kosterlitz-Thouless depairing of interlayer vortex/anti-vortex pairs. The same model accounts well for unusual in-plane dissipation observed previously in Bi 2Sr 2CaCu 2O 8.
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