Non-Gaussian Noise in the In-Plane Transport of Lightly Doped La_{2-x}Sr_{x}CuO_4: Evidence for a Collective State of Charge Clusters

TL;DR

This study investigates in-plane resistance noise in lightly doped La_{2-x}Sr_{x}CuO_{4}, revealing non-Gaussian behavior and evidence for a collective charge cluster state at low temperatures, independent of magnetic field influence.

Contribution

It provides experimental evidence for a collective state of charge clusters in La_{2-x}Sr_{x}CuO_{4}, highlighting slow, correlated charge dynamics at low temperatures.

Findings

Non-Gaussian resistance noise emerges at low T.

Charge clusters coexist with frozen antiferromagnetic domains.

Noise is insensitive to in-plane magnetic fields.

Abstract

A study of the in-plane resistance noise on a high quality single crystal of La_{1.97}Sr_{0.03}CuO_{4} deep inside the spin-glass phase reveals the onset of non-Gaussianity and the insensitivity of the noise to the in-plane magnetic field. The results indicate that the charge dynamics becomes increasingly slow and correlated as temperature T -> 0. The analysis of the higher order noise statistics provides evidence for the existence of a collective ground state of charge clusters, which seem to coexist with charge-poor antiferromagnetic domains that are frozen at such low T.