Double perovskite Ba2NaOsO6: Magnetic structure, Kramers doublet and x-ray magnetic dichroic signals

TL;DR

This paper investigates the magnetic properties of Ba2NaOsO6, revealing its magnetic structure, the formation of a Kramers doublet, and explaining x-ray magnetic dichroic signals through theoretical modeling.

Contribution

It provides a new theoretical analysis of Ba2NaOsO6's magnetic structure and explains experimental XMCD signals using an atomic model of the Kramers doublet.

Findings

Magnetic moments are unified in paramagnetic and ordered states.

Analytic XMCD signals match recent experimental data.

The study clarifies the magnetic symmetry and electronic structure of Ba2NaOsO6.

Abstract

Of all the oxides of osmium, Ba2NaOsO6 is the only one with a substantial ferromagnetic moment. A fresh theoretical study of bulk magnetic properties of the double perovskite is accomplished with an appropriate space group, and an atomic model of a Kramers doublet formed by the single osmium d-electron. It possesses symmetry demanded by the Wyckoff position assigned to Os in a canted ferromagnet. Whereupon, magnetic moments in the paramagnetic and magnetically ordered states of Ba2NaOsO6 are unified. Analytic x-ray magnetic dichroic signals (XMCD) at osmium L2 and L3 absorption edges are presented, and shown to agree with hitherto unexplained recent measurements.