Test for interlayer coherence in a quasi-two-dimensional superconductor

Abstract

Peaks in the magnetoresistivity of the layered superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$, measured in fields $\le 45$ T applied within the layers, show that the Fermi surface is extended in the interlayer direction and enable the interlayer transfer integral ($t_{\perp }\approx 0.04$ meV) to be deduced. However, the quasiparticle scattering rate ${\tau }^{-1}$ is such that $\hslash /\tau \sim 6t_{\perp }$, implying that $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$ meets the criterion used to identify interlayer incoherence. The applicability of this criterion to anisotropic materials is thus shown to be questionable.

5 pages, 4 figures

References in corpus (1)

• Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$

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