The low-temperature Fulde-Ferrell-Larkin-Ovchinnikov phases in 3 dimensionsR. Combescot and C. Mora
Laboratoire de Physique Statistique, Ecole Normale Supérieure 24 rue Lhomond, 75231 Paris Cedex 05, France
received 14 May 2004; accepted in final form 29 July 2004
We consider the nature of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases in three dimensions at low temperature. We introduce a new method to handle the quasiclassical equations for superconductors with space-dependent order parameter, which makes use of a Fourier expansion. This allows us to show that, at T=0, an order parameter given by the linear combination of three cosines oscillating in orthogonal directions is preferred over the standard single-cosine solution. The transition from the normal state to this phase is first order, and quite generally the transition below the tricritical point to the FFLO phases is always first order.
74.20.Fg - BCS theory and its development.
74.25.Dw - Superconductivity phase diagrams.
26.60.+c - Nuclear matter aspects of neutron stars.
© EDP Sciences 2004