CeB6 macroscopically revisited

Magnetic susceptibility anisotropy and high sensitivity magnetostriction measurements are used to investigate the symmetry of CeB(6) ordered states. The antiferromagnetic state is confirmed as tetragonal, but no deviation from the cubic symmetry is observed in the so-called antiferroquadrupolar phas...

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Bibliographic Details
Published in:Physical review letters 2012-01, Vol.108 (2), p.026402-026402
Main Authors: Amara, M, Galéra, R-M
Format: Article
Language:English
Subjects:
Condensed Matter
Physics
Strongly Correlated Electrons
Online Access:Get full text
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Summary:Magnetic susceptibility anisotropy and high sensitivity magnetostriction measurements are used to investigate the symmetry of CeB(6) ordered states. The antiferromagnetic state is confirmed as tetragonal, but no deviation from the cubic symmetry is observed in the so-called antiferroquadrupolar phase, where only volume effects are detected. In this phase, the temperature dependence of the strain field susceptibilities is typical of nonordered quadrupoles. Moreover, while an antiferroquadrupolar order should be cubic, this symmetry is incompatible with the (½½½) ordering wave vector. The antiferroquadrupolar description of CeB(6) phase II is clearly inconsistent, and an alternative model, based on a unidimensional representation of the cube, has to be sought.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.108.026402