Inhomogeneous LOFF phase revisited for surface superconductivity

Details Inhomogeneous LOFF phase revisited for surface superconductivity Inhomogeneous LOFF phase revisited for surface superconductivity

2002-04-22

arxiv.org/abs/cond-mat/0204480v2

Physics

Condensed Matter

Superconductivity

4 pages, 1 fig, revtex 4

Scientific paper

10.1103/PhysRevLett.89.227002

We consider 2D surface superconductivity in high magnetic fields parallel to the surface. We demonstrate that the spin-orbit interaction at the surface changes the properties of the inhomogeneous superconducting Larkin-Ovchinnikov-Fulde-Ferrell state that develops above fields given by the paramagnetic criterion. Strong spin-orbit interaction significantly broadens the range of existence of the LOFF phase, which takes the form of periodic superconducting stripes running along the field direction on the surface, leading to the anisotropy of its properties. In connection with experiments by J.H. Schon et al. [Nature 914, 434 (2001)] on superconductivity of electrically doped films of the cuprate material CaCuO2, we also discuss this problem for the d-wave pairing to indicate the possibility of a re-orientation transition as the magnetic field direction is rotated in the plane parallel to the surface. Our results provide a tool for studying surface superconductivity as a function of doping.

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