Temperature dependence of the Josephson plasma resonance between vortex phases in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

摘要: Abstract Using a microwave cavity perturbation technique, we probe different regimes of vortex interactions within the mixed superconducting state title compound. A Josephson plasma resonance (JPR) is observed which sensitive to correlations between pancake vortices in adjacent layers. Previous investigations have conclusively identified transition liquid-like and pinned solid or glassy phases. Here, study this behavior via field-cooled experiments, obtaining further evidence for transition. These experiments also allow us JPR over wider range temperature magnetic field liquid phase than was previously reported. Theoretical models predict squared frequency ( ω p 2 ) follows power law dependence on (B) both phases, i.e. ∝ B − μ . Our data agree well with model, allowing determination zero-field interlayer critical current density (J0) parameter μ. Indeed, (μ) seen follow indicative continuous two