Article Dans Une Revue Physical Review Letters Année : 2012

CeB6 macroscopically revisited

Résumé

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 non-ordered quadrupoles. Moreover, while an antiferroquadruplar order should be cubic, this symmetry is incompatible with the $\langle\frac{1}{2}\frac{1}{2}\frac{1}{2} \rangle$ 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.

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hal-00667338 , version 1 (09-03-2022)

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Mehdi Amara, Rose-Marie Galéra. CeB6 macroscopically revisited. Physical Review Letters, 2012, 108, pp.026402-1. ⟨10.1103/PhysRevLett.108.026402⟩. ⟨hal-00667338⟩

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