Reinterpretation of the equilibrium magnetization of a Tl-based single crystal. Another phase transition in the mixed state of high-Tc superconductors?

TL;DR

This paper reanalyzes magnetization data of a Tl-based superconductor using a new scaling method, revealing a potential phase transition in the mixed state that was not identified by previous models.

Contribution

It introduces a new scaling procedure for analyzing magnetization data, challenging the adequacy of the Hao-Clem model for high-Tc superconductors.

Findings

Reveals a pronounced kink in M(H) indicating a possible phase transition.

Shows the new scaling method yields different results from the Hao-Clem model.

Suggests the existence of an additional phase transition in the mixed state.

Abstract

We apply a recently developed scaling procedure for the analysis of the equilibrium magnetization M that was measured on a Tl-based single crystal and was recently reported in the literature. The results of our analysis are distinctly different from those obtained in the original publication where the Hao-Clem model served to analyze the magnetization data. We argue that the Hao-Clem model is not adequate for a quantitative description of the mixed state in high-Tc superconductors especially in high magnetic fields. The scaled equilibrium magnetization data reveal a pronounced kink in the M(H) dependence that might be indicative of a phase transition in the mixed state.