D. Achkir et al., ANISOTROPIC FLUX-FLOW STUDIED BY MICROWAVE SURFACE IMPEDANCE MEASUREMENTS IN THE ORGANIC SUPERCONDUCTORS KAPPA-(BEDT-TTF)2CU(NCS)2, Synthetic metals, 56(2-3), 1993, pp. 2917-2922
We have studied the microwave surface resistance of kappa-(BEDT-TTF)2C
u(NCS), under the application of a magnetic field (up to 10 Tesla) ori
ented perpendicular and parallel to die highly conducting plane. In th
e superconducting state the resistance is highly anisotropic and free
of any hysteritic effects; we analyze the data in terms of dissipation
due to vertex motion. The resulting temperature profile of the critic
al field H(c2)(T) for the perpendicular direction shows, in contrast t
o previous result, a downward curvature.