Abstract
The superconducting transition of the organic compounds [kappa]-(BEDT-TTF)[sub 2]X is studied by resistive measurement in a magnetic field up to 10 T applied normal to the conducting plane. For the salts with X = Cu[N(CN)[sub 2]]Br and X = CuCN[N(CN)[sub 2]] the transition shows fan-shaped broadening caused by superconductivity fluctuation. For the X = Cu(NCS)[sub 2] salt the resistivity shows a peak in the transition region in a magnetic field below 4 T. This phenomenon is suppressed in defect-reduced samples for intralayer conduction. We discuss this peak in relation to the thermal fluctuation on the Josephson junction structures in this salt. 16 refs., 3 figs.
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