Magnetic properties of cuprate perovskites in the normal state

TL;DR

This paper models the magnetic properties of cuprate high-T_c superconductors in their normal state using the t-J model, successfully explaining experimental observations without assuming magnetic order.

Contribution

It introduces a self-consistent solution of the t-J model that preserves spin symmetry and is homogeneous, providing new insights into magnetic susceptibility and spin correlations.

Findings

Calculated susceptibility matches experimental data

Explains scaling of static uniform susceptibility

Describes doping and temperature effects on spin spectrum

Abstract

Normal-state magnetic properties of cuprate high-T_c superconductors are interpreted based on the self-consistent solution of the t-J model of Cu-O planes. The solution method retains the rotation symmetry of spin components in the paramagnetic state and has no preset magnetic ordering. The obtained solution is homogeneous. The calculated temperature and concentration dependencies of the magnetic susceptibility are close to those observed in experiment. These results offer explanations for the observed scaling of the static uniform susceptibility and for the changes in the spin correlation length, spin-lattice and spin-echo decay rates in terms of the temperature and doping variations in the spin excitation spectrum.