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

S. W. Lovesey

  • ISIS Facility, STFC, Didcot, Oxfordshire OX11 0QX, United Kingdom; Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom; and Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom

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Phys. Rev. B 112, 214439 – Published 18 December, 2025

DOI: https://doi.org/10.1103/vcvn-5xwb

Abstract

Of all the oxides of osmium, Ba2NaOsO6 is the only one with a substantial ferromagnetic moment. A fresh theoretical study of the double perovskite is accomplished using a different magnetic symmetry, which embraces all relevant published structural information, 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 [Agrestini et al. Phys. Rev. Lett. 133, 066501 (2024)].

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Phys. Rev. B 112, 214439– Published 18 December, 2025
  • Received 25 April 2025
  • Revised 19 October 2025
  • Accepted 1 December 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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