Fermiology and electronic homogeneity of the superconducting overdoped cuprate Tl-2201 revealed by quantum oscillations

TL;DR

This study uses quantum oscillations to explore the Fermi surface and electronic uniformity in overdoped Tl-2201 cuprates, revealing persistent Fermi liquid behavior and implications for the pairing mechanism in high-temperature superconductivity.

Contribution

It provides detailed Fermi surface data across doping levels and shows electronic homogeneity persists in overdoped cuprates, challenging the role of inhomogeneity in superconductivity loss.

Findings

Fermi liquid behavior persists up to at least T_c^{max}/3.5

Superconductivity survives at doping p_c=0.31, higher than in LSCO

Electronic inhomogeneity is not crucial for superconductivity suppression

Abstract

We report an angular quantum oscillation study of Tl_2Ba_2CuO_{6+delta} for two different doping levels (Tc = 10K and 26 K) and determine the Fermi surface size and topology in considerable detail. Our results show that Fermi liquid behavior is not confined to the edge of the superconducting dome and is robust up to at least T_c^{max}/3.5. Superconductivity is found to survive up to a larger doping p_c = 0.31 than in La_{2-x}Sr_xCuO_4. Our data imply that electronic inhomogeneity does not play a significant role in the loss of superconductivity and superfluid density in overdoped cuprates, and point towards a purely magnetic or electronic pairing mechanism