Peculiar Ferrimagnetism Associated with Charge Order in Layered Perovskite GdBaMn2O5

TL;DR

This study investigates the unique ferrimagnetic behavior in GdBaMn2O5 with charge order, revealing temperature-dependent magnetization reversals and sublattice interactions through experimental measurements and molecular field theory analysis.

Contribution

It provides new insights into the magnetic interactions and charge ordering effects in layered perovskite GdBaMn2O5, highlighting the complex ferrimagnetic phenomena.

Findings

Magnetization reversal with temperature in small magnetic fields.

Sharp slope change in magnetization at high fields.

Role of Gd3+ ions and Mn sublattice interactions explained by molecular field theory.

Abstract

The magnetic properties of GdBaMn_{2}O_{5.0}, which exhibits charge ordering, are studied from 2 to 400 K using single crystals. In a small magnetic field applied along the easy axis, the magnetization M shows a temperature-induced reversal which is sometimes found in ferrimagnets. In a large magnetic field, on the other hand, a sharp change in the slope of M(T) coming from an unusual turnabout of the magnetization of the Mn sublattices is observed. Those observations are essentially explained by a molecular field theory which highlights the role of delicate magnetic interactions between Gd^{3+} ions and the antiferromagnetically coupled Mn^{2+}/Mn^{3+} sublattices.