Quasiparticle dynamics and in-plane anisotropy in $Y Ba_2 Cu_3 O_y$ system near onset of superconductivity

TL;DR

This study investigates the in-plane anisotropic carrier dynamics in underdoped YBa₂Cu₃O_y near superconductivity onset, revealing anisotropic scattering likely due to electron density modulation within CuO₂ planes.

Contribution

It provides new insights into the anisotropic electronic response and scattering mechanisms in underdoped cuprates near superconductivity onset.

Findings

Strong anisotropy in electromagnetic response along a-axis

Enhanced scattering rate along the a-axis

Possible modulation of electron density within CuO₂ planes

Abstract

We report on an infrared study of carrier dynamics within the CuO$_{2}$ planes in heavily underdoped detwinned single crystals of YBa$_{2}$Cu$_{3}$O$% _{y}$. In an effort to reveal the electronic structure near the onset of superconductivity, we investigate the strong anisotropy of the electromagnetic response due to an enhancement of the scattering rate along the a-axis. We propose that the origin of this anisotropy is related to a modulation of the electron density within the CuO$_{2}$ planes.