New results on the anomalous precursor diamagnetism in the underdoped La1.9Sr0.1CuO4 superconductor

TL;DR

This paper investigates the anomalous precursor diamagnetism in underdoped La1.9Sr0.1CuO4, suggesting it results from both superconducting fluctuations and Tc-inhomogeneities linked to chemical disorder.

Contribution

It provides new experimental insights linking precursor diamagnetism to Tc-inhomogeneities and compares these findings with paraconductivity data.

Findings

Precursor diamagnetism correlates with Tc-inhomogeneities.

Chemical disorder influences superconducting fluctuations.

Comparison with paraconductivity supports the inhomogeneity hypothesis.

Abstract

The new results summarized here, including a brief comparison with the paraconductivity, further suggest that the anomalous precursor (above Tc) diamagnetism recently observed in the underdoped La1.9Sr0.1CuO4 superconductor could be attributed to the presence, in addition to the conventional superconducting pair fluctuations, of Tc-inhomogeneities with long characteristic lengths associated with chemical disorder.