Abstract

The quasi-two-dimensional superconductor, κ-(BEDT-TTF)2Cu(NCS)2, under a perpendicular field was investigated by NMR relaxation rate measurements at the three different nuclear sites. The vortex dynamics contribution to the relaxation rate was separated from the quasiparticle contribution and found to show a peak formation around 2 K with a site-dependent peak height. The analysis supports that the peak behavior does not come from the simple crossover but from some qualitative change in the vortex dynamics.

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