HIGH-FIELD MAGNETOTRANSPORT OF THE ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2CU(NCS)2 UNDER PRESSURE

We report high pressure magnetotransport on the organic superconductor kappa-(BEDT-TTF)2Cu(NCS)2. Pressure dependences of the area of the cl osed pocket of the Fermi surface, the effective mass of the carriers a nd the energy gap between Fermi surface sections have been measured. T he effective mass is found to fall rapidly with increasing pressure in the region below a critical pressure P(c) approximately 5 kbar. Above P(c) a much weaker pressure dependence is observed. The superconducti ng T(c) also falls rapidly with pressure, disappearing around P(c). Th is demonstrates clearly that the enhancement of the transport mass and the superconducting transition are directly correlated in this organi c superconductor.