Rapid change of electronic anisotropy in overdoped (Y,Ca)Ba2Cu3O7-d

TL;DR

This study investigates how electronic anisotropy in overdoped (Y,Ca)Ba2Cu3O7-d changes with doping, revealing a rapid decrease in anisotropy near optimal doping levels, which impacts understanding of high-temperature superconductivity.

Contribution

It provides new insights into the doping-dependent behavior of electronic anisotropy and pseudogap disappearance in overdoped cuprates.

Findings

Pseudogap-like behavior disappears above p=0.17

Anisotropy ratio g decreases rapidly around p=0.18

g approaches 3 for p > 0.20

Abstract

Electronic anisotropy was studied for overdoped (Y,Ca)Ba2Cu3O7-d with various doping levels (p). It was found that the pseudogap-like behavior in the resistivity disappear when p exceeds 0.17, independent of the oxygen deficiency. The anisotropy ratio (g) estimated from upper critical fields showed a rapid decrease at around p = 0.18, approaching g = 3 for p > 0.20.