Convergence of the Lawrence-Doniach Energy for Layered Superconductors with Magnetic Fields near $H_{c_1}$

TL;DR

This paper studies the behavior of energy minimizers in layered superconductors under magnetic fields near the lower critical field, deriving a Gamma-limit for the Lawrence-Doniach energy as parameters tend to zero.

Contribution

It establishes compactness results and derives a Gamma-limit for the Lawrence-Doniach energy in the regime of weak interlayer coupling and small parameters.

Findings

Compactness of energy minimizers

Gamma-limit of Lawrence-Doniach energy derived

Behavior characterized near critical magnetic field

Abstract

We analyze minimizers of the Lawrence-Doniach energy for three-dimensional highly anisotropic superconductors with layered structure. For such a superconductor occupying a bounded generalized cylinder in $\mathbb{R}^3$ with equally spaced parallel layers, we assume an applied magnetic field that is perpendicular to the layers with intensity $h_{ex}\sim|\ln\epsilon|$ as $\epsilon\rightarrow 0$, where $\epsilon$ is the reciprocal of the Ginzburg-Landau parameter. We prove compactness results for various physical quantities of energy minimizers, and derive a Gamma-limit of the Lawrence-Doniach energy as $\epsilon$ and the interlayer distance $s$ tend to zero, under the additional assumption that the layers are weakly coupled (i.e., $s\gg\epsilon$).