Structural properties of the superconducting salt (BEDT-TTF)3Cl2 • (H2O)2 at low temperatures

被引：22

作者：

Gaultier, J

Hébrard-Bracchetti, S

Guionneau, P

Kepert, CJ

Chasseau, D ^{[1
]}

Ducasse, L

Barrans, Y

Kurmoo, M

Day, P

机构：

[1] Univ Bordeaux 1, UPR 9048, Inst Chim Mat Condensee Bordeaux, Lab Sci Mol, F-33608 Pessac, France

[2] UCL Royal Inst Great Britain, London W1X 4BS, England

[3] Univ Bordeaux 1, Lab Phys Chim Mol, UMR 5803, F-33405 Talence, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1999年 / 145卷 / 02期

关键词：

D O I：

10.1006/jssc.1999.8194

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The X-ray crystal structure of (BEDT-TTF)(3)Cl-2 . (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 (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 Ii is anisotropic and reveals no sharp anomaly. The system remains two dimensional at all temperatures, in agreement with the electrical conductivity measurements. (C) 1999 Academic Press.

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页码：496 / 502

页数：7

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