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

Andrew J. Steele; Peter J. Baker; Tom Lancaster; Francis L. Pratt,; Isabel Franke; Saman Ghannadzadeh; Paul A. Goddard; William Hayes; D.; Prabhakaran; and Stephen J. Blundell

arXiv:1103.1039·cond-mat.str-el·November 9, 2011

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

Andrew J. Steele, Peter J. Baker, Tom Lancaster, Francis L. Pratt,, Isabel Franke, Saman Ghannadzadeh, Paul A. Goddard, William Hayes, D., Prabhakaran, and Stephen J. Blundell

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TL;DR

This study investigates the magnetic ground states of Ba2MOsO6 (M=Li,Na) double perovskites, revealing low-moment ferromagnetism in Ba2NaOsO6 and antiferromagnetism with a spin-flop transition in Ba2LiOsO6, highlighting the role of spin-orbit coupling and frustration.

Contribution

It introduces a probabilistic method to determine magnetic ground states and provides detailed magnetic characterization of Ba2MOsO6 compounds.

Findings

01

Ba2NaOsO6 exhibits low-moment ferromagnetism below 7.2 K.

02

Ba2LiOsO6 is antiferromagnetic with a spin-flop transition at 5.5 T.

03

Both compounds have reduced osmium moments likely due to spin-orbit coupling and frustration.

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 $T_{c} = 7.2 \pm 0.2 K$ , 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 ( $\approx 0.2$ \, $μ_{B}$ ) 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.

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