Polar Behavior in a Magnetic Perovskite Via A-Site Disorder

TL;DR

This paper reveals how A-site disorder induces polar behavior in magnetic perovskites, demonstrated through density functional calculations on (La,Lu)MnNiO$_6$, showing coexistence of polar behavior and ferromagnetism.

Contribution

It introduces a general mechanism for polar behavior in magnetic perovskites based on A-site disorder, supported by computational evidence.

Findings

A-site disorder induces polar behavior in magnetic perovskites.

(La,Lu)MnNiO$_6$ exhibits both polar behavior and ferromagnetism.

The mechanism is applicable to a broad class of magnetic perovskites.

Abstract

We elucidate a mechanism for obtaining polar behavior in magnetic perovskites based on A-site disorder and demonstrate this mechanism by density functional calculations for the double perovskite (La,Lu)MnNiO$_6$ with Lu concentrations at and below 50%. We show that this material combines polar behavior and ferromagnetism. The mechanism is quite general and may be applicable to a wide range of magnetic perovskites.