Spin Correlations and Magnetic Order in Nonsuperconducting Nd_{2-x}Ce_xCuO_{4\pm\delta}

TL;DR

This study uses neutron scattering to examine how doping affects magnetic properties in Nd_{2-x}Ce_xCuO_{4 extpm ext} and compares results with quantum Monte Carlo models, revealing the impact of quantum fluctuations.

Contribution

It provides detailed experimental data on magnetic order and correlations in doped Nd_{2-x}Ce_xCuO_{4 extpm ext} and compares these with theoretical models, highlighting the effects of quantum fluctuations.

Findings

Correlation length matches quantum Monte Carlo predictions

Ordered moment decreases faster than model suggests

Quantum fluctuations significantly suppress magnetic order

Abstract

We report quantitative neutron scattering measurements of the evolution with doping of the N\'eel temperature, the antiferromagnetic correlations, and the ordered moment of as-grown, nonsuperconducting Nd_{2-x}Ce_xCuO_{4\pm\delta} ($0 \le x \le 0.18$). The instantaneous correlation length can be effectively described by our quantum Monte Carlo calculations for the randomly site-diluted nearest-neighbor spin-1/2 square-lattice Heisenberg antiferromagnet. However, quantum fluctuations have a stronger effect on the ordered moment, which decreases more rapidly than for the quenched-disorder model.