Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$

Abstract

Single crystals of the layered organic type II superconductor, $\kappa$-(BEDT-TTF)${}_2$Cu(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.

6 pages 4 figures

References in corpus (4)

• Pairing due to Spin Fluctuations in Layered Organic Superconductors
• Paramagnetic limiting of the upper critical field of the layered organic superconductor $\kappa -(BEDT-TTF{)}_{2}Cu(SCN{)}_2$
• Phase Fluctuations and Kosterlitz-Thouless Transition in Two-Dimensional Fulde-Ferrell-Larkin-Ovchinnikov Superconductors
• Existence of the LOFF State in Superconducting UPd_2Al_3

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