Temperature dependence of the upper critical field of high-Tc superconductors from isothermal magnetization data. Application to polycrystalline samples and ceramics

TL;DR

This paper presents a scaling method to determine the temperature dependence of the normalized upper critical field in high-Tc superconductors from magnetization data, demonstrating its effectiveness on polycrystalline and ceramic samples.

Contribution

The study introduces a new scaling procedure for analyzing magnetization data to extract the temperature dependence of the upper critical field in high-Tc superconductors.

Findings

Scaling procedure accurately describes data across samples

Temperature dependence is orientation-independent

Method confirms universality in high-Tc superconductors

Abstract

Using a recently developed scaling procedure that allows to establish the temperature dependence of the normalized upper critical field from measurements of the equilibrium isothermal magnetization, we analyze experimental data obtained on polycrystalline and ceramic samples. We show that the scaling procedure works quite well in all cases that we have considered. This provides a very strong evidence that the temperature dependencies of the normalized upper critical field are independent of the orientation of an applied magnetic field with respect to the crystallographic axes of these materials.