Metal-insulator transition in $(LaMnO_3)_{2n}/(SrMnO_3)_n$ superlattices

TL;DR

This study uses Monte Carlo simulations to investigate charge and spin modulation in LaMnO3/SrMnO3 superlattices, reproducing the experimentally observed metal-insulator transition and identifying n=3 as the critical point.

Contribution

It provides a computational model that captures the charge, spin, and metal-insulator transition behavior in superlattices, aligning with experimental findings.

Findings

G-type antiferromagnetic barriers separate ferromagnetic layers.

Reproduces the metal-insulator transition with increasing n.

Identifies n=3 as the critical superlattice period.

Abstract

The modulation of charge density and spin order in (LaMnO$_3$)$_{2n}$/(SrMnO$_3$)$_n$ ($n$=1-4) superlattices is studied via Monte Carlo simulations of the double-exchange model. G-type antiferromagnetic barriers in the SrMnO$_{3}$ regions with low charge density are found to separate ferromagnetic LaMnO$_{3}$ layers with high charge density. The recently experimentally observed metal-insulator transition with increasing $n$ is reproduced in our studies, and $n=3$ is found to be the critical value.