Phase diagram of a surface superconductor in parallel magnetic field

Ol'ga V. Dimitrova; M. V. Feigel'man

doi:10.1134/1.1644308

paper

Phase diagram of a surface superconductor in parallel magnetic field

arXiv:cond-mat/0304445 · doi:10.1134/1.1644308

Abstract

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 $Δ (r) \propto cos (Qr)$ at high magnetic fields, with $Q \sim g μ_{B} h / v_{F}$ . We consider the case of relatively strong Rashba interaction and show that at low temperatures $T \leq 0.4 T_{c 0}$ 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 $Δ (r) \propto exp (i Qr)$ 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 $T_{c 0} τ \leq 0.11$ .

arXiv comment5 pages, 1 figure; v2: as published, minor corrections

Phase diagram of a surface superconductor in parallel magnetic field

Abstract

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