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DC and high-frequency conductivity of the organic metals beta'-(BEDT-TTF)2SF5RSO3 (R = CH2CF2 and CHF)
- Source :
- Synthetic Metals 159, 1043 (2009)
- Publication Year :
- 2008
-
Abstract
- The temperature dependences of the electric-transport properties of the two-dimensional organic conductors beta"-(BEDT-TTF)2SF5CH2CF2SO3, beta"-(d8-BEDT-TTF)2SF5CH2CF2SO3, and beta"-(BEDT-TTF)2SF5CHFSO3 are measured by dc methods in and perpendicular to the highly-conducting plane. Microwave measurements are performed at 24 and 33.5 GHz to probe the high-frequency behavior from room temperature down to 2 K. Superconductivity is observed in beta"-(BEDT-TTF)2SF5CH2CF2SO3 and its deuterated analogue. Although all the compounds remain metallic down to low-temperatures, they are close to a charge-order transition. This leads to deviations from a simple Drude behavior of the optical conductivity which become obvious already in the microwave range. In beta"-(BEDT-TTF)2SF5CH2CF2SO3, for instance, charge fluctuations cause an increase in microwave resistivity for T < 20 K which is not detected in dc measurements. beta"-(BEDT-TTF)2SF5CHFSO3 exhibits a simple metallic behavior at all frequencies. In the dc transport, however, we observe indications of localization in the perpendicular direction.<br />Comment: 8 pages, 9 figures
Details
- Database :
- arXiv
- Journal :
- Synthetic Metals 159, 1043 (2009)
- Publication Type :
- Report
- Accession number :
- edsarx.0809.2202
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.synthmet.2009.01.027