Daniel J. Coady, Amanda C. Engler, et al.
ACS Macro Letters
Paper
Inhomogeneous interlayer Josephson coupling in κ-(BEDT-TTF)2Cu(NCS)2
Abstract
In a layered superconductor, the interlayer coupling strength determines the spatial variation of the magnetic fields parallel to the layers. Scanning SQUID microscope images of an edge of a single crystal of the layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 show regions of inhomogeneous coupling as well as trapped interlayer Josephson vortices. Quantitative modelling of individual isolated vortices indicates an interlayer penetration depth λ⊥ é ∼ 60 μm. Previous bulk measurements that indicated a weaker interlayer coupling may have been dominated by inhomogeneities. © 1999 IOP Publishing Ltd.
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