Suppression of Antiferromagnetic Order by Light Hole Doping in La_2Cu_{1-x}Li_xO_4: A ^{139}La NQR Study

TL;DR

This study uses ^{139}La NQR to investigate how light hole doping affects antiferromagnetic order in La_2Cu_{1-x}Li_xO_4, revealing that doped holes form collective structures that suppress magnetic order.

Contribution

It demonstrates that magnetic properties are insensitive to dopant character, indicating the formation of collective hole structures in lightly doped La_2Cu_{1-x}Li_xO_4.

Findings

Magnetic properties are unaffected by dopant impurity type.

Doped holes form collective structures.

Antiferromagnetic order is suppressed by hole doping.

Abstract

^{139}La nuclear quadrupole resonance measurements in lightly doped La_2Cu_{1-x}Li_xO_4 have been performed to reveal the dependence of the magnetic properties of the antiferromagnetic CuO_2 planes on the character of the doped holes and their interactions with the dopant. A detailed study shows that the magnetic properties are remarkably insensitive to the character of the dopant impurity. This indicates that the added holes form previously unrecognized collective structures.