Suppression of antiferromagnetic correlations by dipole-type impurities in lamellar cuprates

TL;DR

This paper demonstrates how dipole-like impurities in lamellar cuprates suppress antiferromagnetic correlations and lower the Neel temperature, aligning with experimental observations.

Contribution

It introduces a renormalization group analysis showing the impact of dipole-type impurities on magnetic correlations in lamellar cuprates.

Findings

Strong reduction of 2D antiferromagnetic correlations

Decrease in 3D Neel temperature

Quantitative agreement with experimental data

Abstract

In doped lamellar cuprates, localized holes create ferromagnetic bonds and cause spin canting similar to that caused by magnetic dipoles. At low temperatures, these dipoles are frozen, behaving like quenched correlated random fields. Renormalization group methods are used to show that such impurities cause a strong reduction of the two-dimensional antiferromagnetic correlations in the non-linear $\sigma$ model, and a related decrease in the three dimensional N\'eel temperature, in quantitative agreement with experiments.