Temperature dependence of the upper critical field of high-Tc superconductors from isothermal magnetization data. Influence of a temperature dependent Ginzburg-Landau parameter

TL;DR

This paper extends a scaling method to include temperature-dependent Ginzburg-Landau parameter effects on the upper critical field in high-Tc superconductors, using microscopic theory to inform the model.

Contribution

It introduces a modified scaling procedure that accounts for temperature-dependent kappa, enhancing the analysis of superconducting properties.

Findings

The modified scaling accurately describes the temperature dependence of the upper critical field.

Microscopic theory provides a realistic model for kappa(T).

The approach improves understanding of high-Tc superconductor behavior.

Abstract

We show that the scaling procedure, recently proposed for the evaluation of the temperature variation of the normalized upper critical field of type-II superconductors, may easily be modified in order to take into account a possible temperature dependence of the Ginzburg-Landau parameter kappa. As an example, we consider kappa (T) as it follows from the microscopic theory of superconductivity.