We report measurements of the de Haas-van Alphen (DHVA) effect and AC susceptibility in the layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2. The amplitude of the DHVA oscillations is attenuated over a wide field range above the irreversibility line, Birr(B), below which a rigid flux lattice is formed. Thus the DHVA effect provides a unique probe of the superconducting fluctuations at high fields in this material. We compare our measurements with other determinations of the superconducting phase diagram of κ-(BEDT-TTF)2Cu(NCS)2.

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Detailed studies of the magnetic field orientation on magnetic quantum oscillations in two charge transfer salts of the molecule ET have been carried out. .After all conventional mechanisms affecting quantum oscillations have been accounted for, we find that the amplitude of the oscillations has an underlying dependence exp(-a tan 0), where f3 is the angle between the normal to the highly-conducting layers and the magnetic field, and a is a constant.

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