Superconducting Fluctuations and the Reduced Dimensionality of the Organic Superconductor κ- (BEDT-TTF)₂Cu(NCS)₂ as Observed through Measurements of the de Haas-van Alphen Effect

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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.