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

Journal article

The magnetic ground states of the isostructural double perovskites Ba 2NaOsO6 and Ba2LiOsO6 are investigated with muon-spin relaxation. In Ba2NaOsO6 long-range magnetic order is detected via the onset of a spontaneous muon-spin precession signal below Tc=7.2±0.2K, while in Ba 2LiOsO6 a static but spatially disordered internal field is found below 8 K. A probabilistic argument is used to show from the observed precession frequencies that the magnetic ground state in Ba 2NaOsO6 is most likely to be low-moment (≈0.2μB) ferromagnetism and not canted antiferromagnetism. Ba2LiOsO6 is antiferromagnetic and we find a spin-flop transition at 5.5T. A reduced osmium moment is common to both compounds, probably arising from a combination of spin-orbit coupling and frustration. © 2011 American Physical Society.

Authors: Steele, A; Baker, P; Lancaster, T; Pratt, F; Franke, I

• Publication status: Published
• Journal: Physical Review B
• Volume: 84
• Issue: 14
• Publication date: 2011-10-10
• DOI: 10.1103/PhysRevB.84.144416
• EISSN: 1550-235X
• ISSN: 1098-0121
• Language: English