Enhancement of Anisotropy due to Fluctuations in Quasi-One-Dimensional Antiferromagnets

TL;DR

This paper explains how quantum and thermal fluctuations enhance anisotropy in the magnetization of a quasi-one-dimensional antiferromagnet under high magnetic fields, using linear spin-wave theory and experimental data comparison.

Contribution

It introduces a theoretical framework accounting for fluctuation-induced anisotropy enhancement in quasi-one-dimensional antiferromagnets.

Findings

Fluctuations cause significant anisotropy enhancement at high fields.

Logarithmic dependence on cutoff parameters explains the anisotropy increase.

The theory aligns well with neutron scattering experimental data.

Abstract

It is shown that the observed anisotropy of magnetization at high magnetic fields in RbMnBr3 , a quasi-one-dimensional antiferromagnet on a distorted stacked triangular lattice, is due to quantum and thermal fluctuations. These fluctuations are taken into account in the framework of linear spin-wave theory in the region of strong magnetic fields. In this region the divergent one-dimensional integrals are cut off by magnetic field and the bare easy-plane anisotropy. Logarithmical dependence on the cutoff leads to the "enhancement" of the anisotropy in magnetization. Comparison between magnetization data and our theory with parameters obtained from neutron scattering experiments has been done.