Anomalous behaviour of the in-plane electrical conductivity of the layered superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$

Abstract

The quasiparticle scattering rates in high-quality crystals of the quasi-two-dimensional superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$ ~are studied using the Shubnikov-de Haas effect and MHz penetration-depth experiments. There is strong evidence that the broadening of the Landau-levels is primarily caused by spatial inhomogeneities, indicating a quasiparticle lifetime for the Landau states $\gg 3$ ps. In contrast to the predictions of Fermi-liquid theory, the scattering time derived from the intralayer conductivity is found to be much shorter ($0.14-0.56$ ps).

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Cited by in corpus (7)

• An Experimental and Semi-Empirical Method to Determine the Pauli-Limiting Field in Quasi 2D Superconductors as applied to $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$: Strong Evidence of a FFLO State
• Persistence to high temperatures of interlayer coherence in an organic superconductor
• Anisotropic scattering in angular-dependent magnetoresistance oscillations of quasi-2D and quasi-1D metals: beyond the relaxation-time approximation
• Inhomogeneous superconductivity in organic conductors: role of disorder and magnetic field
• Interplay between the glassy transition and granular superconductivity in organic materials
• Comparison of the Fermi-surface topologies of kappa-(BEDT-TTF)_2 Cu(NCS)_2 and its deuterated analogue
• Recent high-magnetic-field studies of unusual groundstates in quasi-two-dimensional crystalline organic metals and superconductors