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Structural Properties of the Superconducting Salt (BEDT-TTF)3Cl2·(H2O)2 at Low Temperatures

✍ Scribed by Jacques Gaultier; Sylvie Hébrard-Bracchetti; Philippe Guionneau; Cameron J. Kepert; Daniel Chasseau; Laurent Ducasse; Yvette Barrans; Mohamedally Kurmoo; Peter Day

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
206 KB
Volume
145
Category
Article
ISSN
0022-4596

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✦ Synopsis

The X-ray crystal structure of (BEDT-TTF) 3 Cl 2 ' (H 2 O) 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 (T c ‫؍‬ 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.

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