We present new estimates on the two-dimensional Ginzburg-Landau energy of a type II superconductor in an applied magnetic field varying between the second and third critical fields. In this regime, superconductivity is restricted to a thin layer along the boundary of the sample and we provide new energy lower bounds, proving that the Ginzburg-Landau energy is determined to leading order by the minimization of a simplified 1D functional in the direction perpendicular to the boundary. Estimates relating the density of the Ginzburg-Landau order parameter to that of the 1D problem follow. In the particular case of a disc sample, a refinement of our method leads to a pointwise estimate on the Ginzburg-Landau order parameter, thereby proving a strong form of uniformity of the surface superconductivity layer, related to a conjecture by Xing-Bin Pan.
Correggi M, & Rougerie N (2014). On the Ginzburg-Landau Functional in the Surface Superconductivity Regime. COMMUNICATIONS IN MATHEMATICAL PHYSICS, 332, 1297-1343 [10.1007/s00220-014-2095-9].