Temperature Dependence of the Upper Critical Field in High-Temperature Superconductors: Localization Effects

TL;DR

This paper explains the unusual temperature behavior of the upper critical magnetic field in high-temperature superconductor films by considering localization effects in two-dimensional systems.

Contribution

It introduces a localization-based explanation for the anomalous $H_{c2}$ temperature dependence in high-temperature superconductor films.

Findings

Localization effects account for the anomalous $H_{c2}$ temperature dependence.

The model fits experimental data for $Bi-Sr-Cu-O$ films.

Localization influences are significant in quasi-two-dimensional superconductors.

Abstract

It is shown that the anomalous temperature dependence of the orbital part of the upper critical field $H_{c2}$ observed for epitaxially grown films of high-temperature superconductor $Bi-Sr-Cu-O$ (in wide temperature interval) can be satisfactorily explained by the influence of localization effects in two-dimensional (quasi-two-dimensional) case.