An unusual metal-insulator transition: bis(tetramethyltetraselenafulvalenium)-perrhenate (TMTSF2ReO4)
| Autor: | Claus Schelde Jacobsen, Kell Mortensen, Klaus Bechgaard, H. J. Pedersen, J.B. Torrance |
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| Rok vydání: | 1982 |
| Předmět: |
Perrhenate
Materials science Condensed matter physics business.industry Peierls transition Band gap General Engineering General Physics and Astronomy Crystal structure Electron Condensed Matter Physics chemistry.chemical_compound Semiconductor chemistry Seebeck coefficient Metal–insulator transition business |
| Zdroj: | Journal of Physics C: Solid State Physics. 15:2651-2663 |
| ISSN: | 0022-3719 |
| DOI: | 10.1088/0022-3719/15/12/014 |
| Popis: | An experimental study of the 2:1 charge transfer state of Delta 2,2'-bi-4,5-dimethyl=1,3-diselenolylidene (TMTSF) and ReO4-is presented. The crystal structure is isomorphous with that of other (TMTSF)2X salts. Physical properties including DC and microwave conductivity, thermoelectric power, optical properties, and magnetic properties, all show a sharp metal-insulator transition at Tc=182 K. Below Tc, (TMTSF)2ReO4 is found to be a non-magnetic semiconductor with a large energy gap of 200 meV. Based on these results and on previously reported changes in the crystal structure at Tc, it is suggested that (TMTSF)2ReO4 undergoes a Peierls transition, driven by the interaction of the electrons with the ReO4- anions. The aspects of an order-disorder transformation in the anionic system are included in a simple model for the material. |
| Databáze: | OpenAIRE |
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