Static properties of a quasi one-dimensional antiferromagnet in magnetic field

TL;DR

This paper investigates how quantum fluctuations influence the magnetic properties of a quasi-one-dimensional antiferromagnet, revealing significant reductions in susceptibility and magnetization, with results supported by simulations and experiments.

Contribution

It provides a detailed analysis of zero-point fluctuation effects on magnetostatic properties in quasi-1D antiferromagnets, including a universal high-field magnetization formula.

Findings

Substantial reduction of susceptibility and sublattice magnetization due to quantum fluctuations

Nonlinear magnetization curve at low fields, universal behavior at high fields

Renormalization of the spin-flop field at zero temperature

Abstract

We calculate the effect of zero-point fluctuations on the magnetostatic properties of a quasi one-dimensional antiferromagnetic helimagnet with and without in-plane anisotropy. We find substantial reduction of the uniform susceptibility and the sublattice magnetization from their classical values and appreciable renormalization of the spin-flop field at $T=0$. The magnetization curve varies nonlinearly at small fields and is described by a universal formula at high fields. The results are compared with numerical simulations on one-dimensional systems and measurements in the CsNiCl$_3$-type compounds.