Incommensurate magnetic response in cuprate perovskites

TL;DR

This paper models the incommensurate magnetic response in normal-state cuprate perovskites using Mori's approach and the t-J model, successfully explaining experimental dispersion patterns of susceptibility maxima.

Contribution

It provides a theoretical explanation for the incommensurate magnetic response in cuprates, linking susceptibility dispersion to localized spins and spin-excitation damping effects.

Findings

Dispersion of susceptibility maxima forms two parabolas converging at the antiferromagnetic wave vector.

Maxima locations are at specific incommensurate points related to doping levels.

Dip in spin-excitation damping explains the lower parabola in the dispersion.

Abstract

The incommensurate magnetic response of the normal-state cuprate perovskites is interpreted based on Mori's memory function approach and the t-J model of Cu-O planes. In agreement with experiment the calculated dispersion of the susceptibility maxima has the shape of two parabolas with upward and downward branches which converge at the antiferromagnetic wave vector. The maxima are located at $({1/2},{1/2}\pm\delta)$, $({1/2}\pm\delta,{1/2})$ and at $({1/2}\pm\delta,{1/2}\pm\delta)$, $({1/2}\pm\delta,{1/2}\mp\delta)$ in the lower and upper parabolas, respectively. The upper parabola reflects the dispersion of magnetic excitations of the localized Cu spins, while the lower parabola arises due to a dip in the spin-excitation damping at the antiferromagnetic wave vector. For moderate doping this dip stems from the weakness of the interaction between the spin excitations and holes near the hot spots.