Structural Properties of the Superconducting Salt (BEDT-TTF)3Cl2·(H2O)2 at Low Temperatures
| Autor: | Daniel Chasseau, Sylvie Hébrard-Bracchetti, Peter Day, J. Gaultier, Yvette Barrans, C.J. Kepert, Mohamedally Kurmoo, Philippe Guionneau, Laurent Ducasse |
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| Rok vydání: | 1999 |
| Předmět: |
Superconductivity
Condensed matter physics Stereochemistry Crystal structure Condensed Matter Physics Thermal expansion Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound chemistry Electrical resistivity and conductivity Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Metal–insulator transition Anisotropy Tetrathiafulvalene Ambient pressure |
| Zdroj: | Journal of Solid State Chemistry. 145:496-502 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.1999.8194 |
| Popis: | The X-ray crystal structure of (BEDT-TTF)3Cl2·(H2O)2 [BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene] has been determined at 190, 130, and 10 K. The broad metal–insulator transition (100–160 K) observed in the resistivity data at ambient pressure, and the pressure induced superconductivity (Tc=5 K at 1.2 GPa) can be associated with temperature-dependent motion of the molecules within the unit cell and charge redistribution among the three independent BEDT-TTF molecules. The motion can be considered as a dimerization of the BEDT-TTF along the a-axis. The thermal expansion tensor in the range 12 to 295 K is anisotropic and reveals no sharp anomaly. The system remains two dimensional at all temperatures, in agreement with the electrical conductivity measurements. |
| Databáze: | OpenAIRE |
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