Diamagnetism around the Meissner transition in a homogeneous cuprate single crystal

TL;DR

This study measures in-plane diamagnetism in a high-quality cuprate superconductor around the Meissner transition, confirming it as a conventional Ginzburg-Landau transition through detailed analysis.

Contribution

It provides experimental evidence supporting the conventional Ginzburg-Landau description of the superconducting transition in a homogeneous layered cuprate.

Findings

Diamagnetism data aligns with Ginzburg-Landau theory

Transition is consistent with a homogeneous superconductor

Minimized inhomogeneity effects in measurements

Abstract

The in-plane diamagnetism around the Meissner transition was measured in a Tl$_2$Ba$_2$Ca$_2$Cu$_3$O$_{10}$ single crystal of high chemical and structural quality, which minimizes the inhomogeneity and disorder rounding effects on the magnetization. When analyzed quantitatively and consistently above and below the transition in terms of the Ginzburg-Landau (GL) approach with fluctuations of Cooper pairs and vortices, these data provide a further confirmation that the observed Meissner transition is a conventional GL superconducting transition in a homogeneous layered superconductor.