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

被引：36

作者：

Steele, Andrew J. ^{[1
]}

Baker, Peter J. ^{[2
]}

Lancaster, Tom ^{[1
]}

Pratt, Francis L. ^{[2
]}

Franke, Isabel ^{[1
]}

Ghannadzadeh, Saman ^{[1
]}

Goddard, Paul A. ^{[1
]}

Hayes, William ^{[1
]}

Prabhakaran, D. ^{[1
]}

Blundell, Stephen J. ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Sci & Technol Facil Council, Didcot OX11 0QX, Oxon, England

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 14期

基金：

英国工程与自然科学研究理事会;

关键词：

CRYSTAL-GROWTH; OSMIUM;

D O I：

10.1103/PhysRevB.84.144416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic ground states of the isostructural double perovskites Ba2NaOsO6 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 T-c = 7.2 +/- 0.2 K, while in Ba2LiOsO6 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 Ba2NaOsO6 is most likely to be low-moment (approximate to 0.2 mu(B)) ferromagnetism and not canted antiferromagnetism. Ba2LiOsO6 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.

引用

页数：4

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