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We present magnetic-torque measurements of the organic superconductork-(BEDT-TTF)2Cu(NCS)2 for in-plane magnetic fields up to 32 T. In this layeredtwo-dimensional compound the superconductivity can persist even in fields abovethe Pauli limit of about 21 T. There, a pronounced upturn of theupper-critical-field line occurs and the superconducting phase-transition linesplits and forms an additional high magnetic field phase. k-(BEDT-TTF)2Cu(NCS)2is a spin-singlet superconductor, therefore, such a superconducting high-fieldphase beyond the Pauli limit can originate only from Cooper pairing with finitecenter-of-mass momentum. The measurements are discussed in connection with aFulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, in accordance with earlierspecific-heat observations. The torque experiments allow us to investigate thehigh magnetic-field phase diagram and the FFLO state of k-(BEDT-TTF)2Cu(NCS)2in great detail.

physical review. b, condensed matter and materials physics

Magnetic-Torque Evidence for the Fulde-Ferrell-Larkin-Ovchinnikov State  for In-Plane Magnetic Fields in the Organic Superconductor  k-(BEDT-TTF)2Cu(NCS)2