Phase diagram of a surface superconductor in parallel magnetic field

Details Phase diagram of a surface superconductor in parallel magnetic field Phase diagram of a surface superconductor in parallel magnetic field

2003-04-19

arxiv.org/abs/cond-mat/0304445v2

JETP Letters, Vol. 78, No. 10, pp 637-641 (2003)

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure; v2: as published, minor corrections

Scientific paper

10.1134/1.1644308

Detailed theory of phase diagram of clean 2D surface superconductor in a parallel magnetic field is presented. Regular spin-orbital interaction of the Rashba type is known to produce inhomogeneous superconductive state similar to the Larkin-Ovchinnikov-Fulde-Ferrel (LOFF) state with $\Delta({\bf r})\propto \cos({\bf Qr})$ at high magnetic fields, with $Q \sim g\mu_B h/v_F$. We consider the case of relatively strong Rashba interaction and show that at low temperatures $T\leq 0.4 T_{c0}$ the LOFF-type state is separated from the usual homogeneous state by the first-order phase transition line. At higher temperatures new "helical" state with $\Delta({\bf r}) \propto \exp(i{\bf Qr})$ intervene between uniform BCS state and LOFF-like state. One component of superfluid density tensor $n_s$ vanishes on the second-order transition line between BCS state and helical state. Nonmagnetic impurities suppresses both inhomogeneous states, and eliminate them completely at $T_{c0}\tau \leq 0.11$.

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