Muon-Spin-Rotation Measurements of the Penetration Depth in the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

TL;DR

This study used muon spin rotation to measure the in-plane penetration depth in the electron-doped superconductor Sr0.9La0.1CuO2, revealing deviations from the Uemura relation typical of hole-doped high-Tc superconductors.

Contribution

First absolute measurement of lambda_ab(0) in electron-doped HTS using muon spin rotation, showing significant differences from hole-doped counterparts.

Findings

Measured lambda_ab(0)=116 nm at zero temperature

Depolarization rate is more than four times higher than expected from the Uemura line

Electron-doped HTS does not follow the Uemura relation

Abstract

Muon spin rotation (mSR) measurements of the in-plane penetration depth lambda_ab have been performed in the electron-doped infinite layer high-Tc superconductor (HTS) Sr0.9La0.1CuO2. Absence of the magnetic rare-earth ions in this compound allowed to measure for the first time the absolute value of lambda_ab(0) in electron-doped HTS using mSR. We found lambda_ab(0)=116(2) nm. The zero-temperature depolarization rate sigma(0)?1/lambda_ab(0)^2=4.6(1) MHz is more than four times higher than expected from the Uemura line. Therefore this electron-doped HTS does not follow the Uemura relation found for hole-doped HTS.