Abstract

Vortex structure in organic superconductors κ-(BEDT-TTF) 2Cu(NCS) 2 and κ-(BEDT-TTF) 2CuN(CN) 2Br has been studied by use of the decoration technique at magnetic fields up to 23 Oe directed perpendicular to the two-dimensional superconducting bc-plane. A quantitative analysis of high quality vortex lattice (VL) images reveals an anisotropy of the VL which can be interpreted as a penetration depth anisotropy.

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