Effect of the pseudogap on the uniform magnetic susceptibility of Y1-xCaxBa2Cu3O7-d

TL;DR

This study investigates how the pseudogap influences the magnetic susceptibility in Y1-xCaxBa2Cu3O7-d, revealing an abrupt onset of the pseudogap at a specific hole content and its rapid growth as p decreases.

Contribution

It provides experimental evidence for the sudden appearance and growth of the pseudogap in relation to planar hole content in cuprate superconductors.

Findings

Pseudogap appears abruptly at p ~ 0.19

Pseudogap grows rapidly with decreasing p

Characteristic pseudogap temperature scale was identified

Abstract

The effects of planar hole content, p, on the temperature-dependent uniform (q = 0) magnetic susceptibility, c(T), of polycrystalline Y1-xCaxBa2Cu3O7-d compounds with 0.0 </= x </= 0.20 were investigated over a wide range of oxygen deficiency (d). Systematic variations in c(T) were found with changing p. The characteristic pseudogap temperature scale, Eg(p)/kB, was extracted from the analysis of the c(T,p) data. We have found clear evidence that the pseudogap in the quasi-particle spectral weight appears abruptly at a planar hole content of p ~ 0.19, and that it grows rapidly with decreasing p.