Magnetic and dielectric properties of chain cuprate Li

Abstract

Abstractauthoren We propose a microscopic model in order to study the multiferroic properties of Li2ZrCuO4 at low temperatures taking into account the competing nearest and next‐nearest magnetic interactions, frustration, and a linear magnetoelectric coupling. To understand the experimental observation an anti‐ferroelectric interaction between the CuO2 chains is included. The magnetization Mfalse(Tfalse) exhibits a peak at the antiferromagnetic transition temperature TN, whereas the dielectric function εafalse(T,Hafalse) offers no anomaly at that temperature, however ε can be governed by an external magnetic field Ha. It decreases with increasing magnetic field Ha. Our analysis provides no indication about a glass‐like order of Li(1) discussed controversially.