Low-moment magnetism in the double perovskites Ba2MOsO6 (M=Li,Na)

Abstract

The magnetic ground states of the isostructural double perovskites Ba${}_2$NaOsO${}_6$ and Ba${}_2$LiOsO${}_6$ are investigated with muon-spin rotation. In Ba${}_2$NaOsO${}_6$ long-range magnetic order is detected via the onset of a spontaneous muon-spin precession signal below $T_{\mathrm{c}}=7.2\pm 0.2\mathrm{K}$, while in Ba${}_2$LiOsO${}_6$ a static but spatially-disordered internal field is found below 8 K. A novel probabilistic argument is used to show from the observed precession frequencies that the magnetic ground state in Ba${}_2$NaOsO${}_6$ is most likely to be low-moment ($\approx 0.2$\,${\mu }_{\mathrm{B}}$) ferromagnetism and not canted antiferromagnetism. Ba${}_2$LiOsO${}_6$ is antiferromagnetic and we find a spin-flop transition at 5.5\,T. A reduced osmium moment is common to both compounds, probably arising from a combination of spin-orbit coupling and frustration.

4 pages, 4 figures

References in corpus (5)

• Exotic phases induced by strong spin-orbit coupling in ordered double perovskites
• Ferromagnetism in the Mott insulator Ba2NaOsO6
• Cooperative Effect of Electron Correlation and Spin-Orbit Coupling on the Electronic and Magnetic Properties of Ba2NaOsO6
• Orbital-quenching-induced magnetism in Ba_2NaOsO_6
• Magnetic order in quasi-two-dimensional molecular magnets investigated with muon-spin relaxation

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