Dissipation in the superconducting state of kappa-(BEDT-TTF)2Cu(NCS)2
Abstract
We have studied the interlayer resistivity of the prototypical quasi-two-dimensional organic superconductor -(BEDT-TTF)2Cu(NCS)2 as a function of temperature, current and magnetic field, within the superconducting state. We find a region of non-zero resistivity whose properties are strongly dependent on magnetic field and current density. There is a crossover to non-Ohmic conduction below a temperature that coincides with the 2D vortex solid -- vortex liquid transition. We interpret the behaviour in terms of a model of current- and thermally-driven phase slips caused by the diffusive motion of the pancake vortices which are weakly-coupled in adjacent layers, giving rise to a finite interlayer resistance.
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