Orientational Effect of the In-Plane Magnetic Field on the FFLO Modulation in Layered Superconductors

We present the analysis of the Fulde-Ferrell-Larkin-Ovchinnikov phase in an s-wave superconducting layered system in parallel magnetic field. We show that in the close vicinity of the tricritical point in the system with elliptical Fermi surface the orbital effect pins the FFLO modulation vector perpendicular to the applied magnetic field. At low temperatures, the FFLO modulation can acquire different directions.Superconductivity in quantum-size regimeNew Century of Superconductivity: Ideas, Materials, Technologie