Two dimensional magnetic correlation in the unconventional corrugated layered oxides (Ba,Sr)$_4$Mn$_3$O$_{10}$

TL;DR

This study investigates the two-dimensional magnetic correlations in layered oxides (Ba,Sr)$_4$Mn$_3$O$_{10}$, revealing low-dimensional magnetic behavior and multiferroic properties through magnetic susceptibility, heat capacity, and dielectric measurements.

Contribution

It provides the first systematic analysis confirming two-dimensional Heisenberg model applicability and multiferroic behavior in these layered manganese oxides.

Findings

Magnetic susceptibility shows broad hump indicating low-dimensional correlations.

Heat capacity data supports two-dimensional magnetic interactions.

Dielectric anomalies suggest multiferroic behavior near magnetic transition.

Abstract

Both Ba$_4$Mn$_3$O$_{10}$ and Sr$_4$Mn$_3$O$_{10}$ crystallize in an orthorhombic crystal structure consisting of corrugated layers containing Mn$_3$O$_{12}$ polydedra. The thermal variation of magnetic susceptibility of the compositions consists of a broad hump like feature indicating the presence of low dimensional magnetic correlation. We have systematically investigated the magnetic data of these compounds and found that the experimental results match quite well with the two dimensional Heisenberg model of spin-spin interaction. The two dimensional nature of the magnetic spin-spin interaction is supported by the low temperature heat capacity data of Ba$_4$Mn$_3$O$_{10}$. Interestingly, both the samples show dielectric anomaly near the magnetic ordering temperature indicating multiferroic behavior.