Abstract
We report a study of the de Haas-van Alphen effect near the upper critical field in superconducting κ-(BEDT-TTF) 2Cu(NCS) 2. The experiments have been carried out for a range of sample orientation with respect to the magnetic field and temperatures down to 20 mK. On entering the vortex state, an attenuation of the dHvA signal is observed relative to an extrapolation of the standard Lifshitz-Kosevich formula, using band parameters measured in the normal state.
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