The ground state of heavily-overdoped non-superconducting La$_{2-x}$Sr$_x$CuO$_4$

TL;DR

This study investigates the ground state of heavily overdoped, non-superconducting La$_{1.7}$Sr$_{0.3}$CuO$_4$, revealing a correlated Fermi-liquid state with dominant electron-electron scattering, expanding understanding of cuprate phase diagrams.

Contribution

It provides detailed thermodynamic and transport evidence for a Fermi-liquid ground state in heavily overdoped cuprates beyond the superconducting phase.

Findings

Existence of a correlated Fermi-liquid ground state in overdoped La$_{2-x}$Sr$_x$CuO$_4$

Charge transport dominated by intense electron-electron scattering at finite temperatures

Confirmation that non-superconducting overdoped cuprates retain Fermi-liquid properties

Abstract

We report detailed thermodynamic and transport measurements for non-superconducting La$_{1.7}$Sr$_{0.3}$CuO$_4$. Collectively, these data reveal that a highly-correlated Fermi-liquid ground state exists in La$_{2-x}$Sr$_x$CuO$_4$ beyond the superconducting dome, and confirm that charge transport in the cuprates is dominated at finite temperatures by intense electron-electron scattering.