Anisotropic quasiparticle scattering rates in slightly underdoped to optimally doped high-temperature \LSCO\ superconductors

TL;DR

This study investigates the anisotropic quasiparticle scattering rates in slightly underdoped to optimally doped ext{LSCO} high-temperature superconductors using ARPES, revealing linear energy dependence and directional anisotropy, with implications for quantum-criticality.

Contribution

It provides detailed measurements of scattering rates as functions of energy and momentum, highlighting anisotropic behavior and potential links to quantum-critical phenomena in ext{LSCO} superconductors.

Findings

Scattering rate scales linearly with energy up to 0.4 eV.

Strong anisotropy in scattering rate with a minimum along the (0,0)-($\pi,\pi$) direction.

Possible connection to a quantum-critical point.

Abstract

An angle-resolved photoemission study of the scattering rate in the superconducting phase of the high-temperature superconductor \LSCO\ with $x=0.145$ and $x=0.17$, as a function of binding energy and momentum, is presented. We observe that the scattering rate scales linearly with binding energy up to the high-energy scale $E_1\sim0.4$ eV. The scattering rate is found to be strongly anisotropic, with a minimum along the (0,0)-($\pi,\pi$) direction. A possible connection to a quantum-critical point is discussed.