Cu NQR and NMR Studies of Optimally Doped Ca2-xNaxCuO2Cl2

TL;DR

This study investigates the local electronic environment of an optimally doped cuprate superconductor Ca2-xNaxCuO2Cl2 using Cu NQR and NMR techniques, revealing complex spectral features and relaxation behaviors similar to other cuprates.

Contribution

It provides new insights into the local electronic properties of Ca2-xNaxCuO2Cl2 through detailed NQR and NMR measurements at optimal doping levels.

Findings

Observed multiple broad NQR frequency spectrum.

Detected nonexponential Cu nuclear spin-lattice relaxation.

Findings are similar to those in La2-xSrxCuO4-d.

Abstract

We report on Cu nuclear quadrupole resonance (NQR) and NMR studies of an optimally hole-doped superconductor Ca2-xNaxCuO2Cl2 (Tc ~ 28 K for x ~ 0.2). In spite of robust oxygen composition, we observed a multiple broad NQR frequency spectrum and nonexponential Cu nuclear spin-lattice relaxation, being similar to those of La2-xSrxCuO4-d.