Article

# Has the FFLO state been observed in the organic superconductor $\kappa-$(BEDT-TTF$)_2$Cu(NCS$)_2$ ?

07/2000;
Source: arXiv

ABSTRACT We compare the theoretical anisotropic upper critical field $H_{C}(\Theta,T)$ of a quasi-two-dimensional d-wave superconductor with recent $H_{c2}$ data for the layered organic superconductor $\kappa-(BEDT-TTF)_2Cu(NCS)_2$. We find agreement both with regard to the angular and the temperature dependence of $H_{C}$. This supports the suggestion that the Fulde-Ferrell-Larkin-Ovchinnikov state (FFLO state) exists in this material for exactly plane-parallel orientation of the magnetic field. Indications of precursor states, occurring for small deviations from the plane-parallel field direction, are also pointed out and further measurements for confirming the existence of the FFLO state are proposed.

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20 Apr 2013

### Keywords

Fulde-Ferrell-Larkin-Ovchinnikov state

layered organic superconductor $\kappa-(BEDT-TTF)_2Cu(NCS)_2$

magnetic field

plane-parallel field direction

quasi-two-dimensional d-wave superconductor

small deviations

temperature dependence