Abstract
Observation of a Josephson plasma resonance in κ-(ET) 2 Cu(NCS) 2 , below T c (∼10 K), enables investigation of the vortex phase diagram within the mixed state of this highly anisotropic type-II superconductor. Temperature dependent studies seem to indicate a transition in the vortex structure near the irreversibility line, not previously observed in this material using this technique. We also show that the frequency dependence of the resonance between 28-153 GHz is best described by a week pinning theory previously derived by Bulaevskii et al.
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