Neel Temperature for Quasi-Two-Dimensional Dipolar Antiferromagnets

TL;DR

This paper calculates the Ne9el temperature for quasi-two-dimensional dipolar antiferromagnets using theoretical methods, showing good agreement with experimental data for several compounds.

Contribution

It introduces a combined theoretical approach using linear spin-wave theory and high temperature expansion to predict Ne9el temperatures in dipolar antiferromagnets.

Findings

Predicted Ne9el temperatures match experimental values.

Method effectively models quasi-2D dipolar antiferromagnets.

Applicable to various compounds like K2MnF4 and Rb2MnF4.

Abstract

We calculate the N\'eel temperature $T_N$ for two-dimensional isotropic dipolar Heisenberg antiferromagnets via linear spin-wave theory and a high temperature expansion, employing the method of Callen. The theoretical predictions for $T_N$ for K$_2$MnF$_4$, Rb$_2$MnF$_4$, Rb$_2$MnCl$_4$ and (CH$_3$NH$_3$)$_2$MnCl$_4$ are in good agreement with the measured values.