As–As dimerization, Fermi surfaces and the anomalous electrical transport properties of UAsSe and ThAsSe
| Autor: | P A Midgley, Albert Prodan, Raymond Withers, R Vincent, Herman J. P. van Midden, J Schoenes |
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| Rok vydání: | 2006 |
| Předmět: |
Phase transition
Condensed matter physics Chemistry Fermi level Charge density Fermi surface Electronic structure Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry symbols.namesake Materials Chemistry Ceramics and Composites symbols Kondo effect Physical and Theoretical Chemistry Electronic band structure Charge density wave |
| Zdroj: | Journal of Solid State Chemistry. 179:2190-2198 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2006.04.016 |
| Popis: | A temperature dependent electron diffraction study has been carried out on UAsSe to search for evidence of As–As dimerization at low temperature. A highly structured characteristic diffuse intensity distribution, closely related to that recently reported for ThAsSe, has been observed at low temperature and interpreted in terms of a gradual charge density wave type phase transition upon lowering of temperature involving disordered As–As dimerization within (001) planes. Plausible models of the proposed As–As dimerization have been obtained using a group theoretical approach. Electronic band structure calculations of ThAsSe and UAsSe have been used to search for potential Fermi surface nesting wave-vectors. The results are in good agreement with the experimentally observed diffuse intensity distributions in both cases. |
| Databáze: | OpenAIRE |
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