Muons and magnets

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Superconductors: 100 years on

The New Scientist Elsevier 212:2837 (2011) viii
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Superconductors: Cold beginnings

The New Scientist Elsevier 212:2837 (2011) ii-iii
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Superconductors: Getting warmer

The New Scientist Elsevier 212:2837 (2011) iv-v
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Superconductors: What they're good for

The New Scientist Elsevier 212:2837 (2011) vi-vii
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Low-moment magnetism in the double perovskites Ba2MOsO 6 (M=Li,Na)

Physical Review B - Condensed Matter and Materials Physics 84:14 (2011)

Authors:

AJ Steele, PJ Baker, T Lancaster, FL Pratt, I Franke, S Ghannadzadeh, PA Goddard, W Hayes, D Prabhakaran, SJ Blundell

Abstract:

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.
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