Atomic scale chemical fluctuation in LaSrVMoO6: A proposed halfmetallic antiferromagnet

TL;DR

This study investigates LaSrVMoO6, revealing it is not a half metal or ordered antiferromagnet but exhibits unusual local chemical fluctuations that influence its electronic and magnetic properties.

Contribution

The paper provides detailed experimental and theoretical analysis showing LaSrVMoO6's true nature, challenging previous claims of it being an almost real half metallic antiferromagnet.

Findings

LaSrVMoO6 is neither a half metal nor an ordered antiferromagnet.

Unusual local chemical fluctuations are observed.

Chemical fluctuations explain the compound's electronic and magnetic properties.

Abstract

Half metallic antiferromagnets (HMAFM) have been proposed theoretically long ago but have not been realized experimentally yet. Recently, a double perovskite compound, LaSrVMoO6, has been claimed to be an almost real HMAFM system. Here, we report detailed experimental and theoretical studies on this compound. Our results reveal that the compound is neither a half metal nor an ordered antiferromagnet. Most importantly, an unusual chemical fluctuation is observed locally, which finally accounts for all the electronic and magnetic properties of this compound.