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

Details Has the FFLO state been observed in the organic superconductor $κ-$(BEDT-TTF$)_2$Cu(NCS$)_2$ ? Has the FFLO state been observed in the organic superconductor $κ-$(BEDT-TTF$)_2$Cu(NCS$)_2$ ?

2000-06-21

arxiv.org/abs/cond-mat/0006327v1

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures, accepted for publication in Journal of Physics: Condensed Matter, issue 28 (cover date 17 July), pp L471--

Scientific paper

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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