Perovskite BaCrO_{3}: completing a materials system with an anomalous Mott transition

TL;DR

This paper reports the synthesis and characterization of BaCrO_{3} films, revealing an anomalous Mott transition where magnetism does not depend on metallic or insulating states, expanding the understanding of perovskite chromates.

Contribution

It introduces BaCrO_{3} as a new member of the perovskite chromate family with unique magnetic and electronic properties, highlighting an unusual Mott transition.

Findings

BaCrO_{3} films are insulating with weak ferromagnetism.

BaCrO_{3} has a larger lattice constant than related chromates.

Magnetism is independent of metallic or insulating behavior in BaCrO_{3}.

Abstract

We have synthesized and characterized laser-deposited film samples of perovskite BaCrO_{3}, a missing member of the perovskite-chromate family. The BaCrO_{3} films have a substantially larger lattice constant than other chromates, are insulating, and exhibit weak ferromagnetism likely associated with canted antiferromagnetism. Comparison with the other sister compounds CaCrO_{3} and SrCrO_{3} suggest an anomalous Mott transition where magnetism is independent of whether the compound is metallic or insulating