Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)₂Cu(NCS)₂
Singleton, J. · Symington, J. A. · Nam, M. -S. · Ardavan, A. · Kurmoo, M. · Day, P.
Original · EN
Single crystals of the layered organic type II superconductor, κ-(BEDT-TTF)₂Cu(NCS)₂, have been studied in magnetic fields of up to 33 T and at temperatures between 0.5 K and 11 K using a compact differential susceptometer. When the magnetic field lies precisely in the quasi-two-dimensional planes of the material, there is strong evidence for a phase transition from the superconducting mixed state into a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, manisfested as a change in the rigidity of the vortex system. The behaviour of the transition as a function of temperature is in good agreement with theoretical predictions.
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