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CeB6 macroscopically revisited
1Institut Néel, CNRS et Université Joseph Fourier, Grenoble, France. mehdi.amara@grenoble.cnrs.fr
Physical Review Letters
|February 14, 2012
Summary
This study investigates the ordered states of CeB(6) using magnetic measurements. Findings reveal inconsistencies in the antiferroquadrupolar phase, suggesting a need for alternative models beyond cubic symmetry.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- Cerium hexaboride (CeB6) exhibits complex magnetic ordering, including antiferromagnetic and antiferroquadrupolar phases.
- Understanding the symmetry of these ordered states is crucial for theoretical models and predicting material properties.
Purpose of the Study:
- To investigate the symmetry of ordered states in CeB6.
- To evaluate the validity of the current antiferroquadrupolar description for phase II.
Main Methods:
- Magnetic susceptibility anisotropy measurements.
- High-sensitivity magnetostriction measurements.
- Analysis of temperature dependence of strain field susceptibilities.
Main Results:
- The antiferromagnetic state of CeB6 is confirmed to be tetragonal.
- No deviation from cubic symmetry was observed in the antiferroquadrupolar phase (phase II).
- Observed strain field susceptibilities are consistent with non-ordered quadrupoles.
Conclusions:
- The current antiferroquadrupolar description of CeB6 phase II is inconsistent with experimental data and theoretical expectations.
- The cubic symmetry is incompatible with the observed ordering wave vector (½½½).
- An alternative model, possibly based on a unidimensional representation, is required to explain the observed phenomena in CeB6 phase II.
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