This article has an erratum: [https://doi.org/10.1209/0295-5075/89/69901]
Volume 84, Number 6, December 2008
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||03 December 2008|
Interacting dipoles in type-I clathrates: Why glass-like though crystalline?
Materials Science Division, Argonne National Laboratory - 9700 South Cass Avenue, Argonne, IL 60439, USA
2 Advanced Photon Source, Argonne National laboratory - 9700 South Cass Avenue, Argonne, IL 60439, USA
Accepted: 19 November 2008
Almost identical thermal properties of type-I clathrate compounds to those of glasses follow naturally from the consideration that off-centered guest ions possess electric dipole moments. Local fields from neighbor dipoles create many potential minima in the configuration space. A theoretical analysis based on two-level tunneling states demonstrates that interacting dipoles are a key to quantitatively explain the glass-like behaviors of low-temperature thermal properties of type-I clathrate compounds with off-centered guest ions.
PACS: 66.35.+a – Quantum tunneling of defects / 61.72.Bb – Theories and models of crystal defects / 61.43.-j – Disordered solids
© EPLA, 2008
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