DC and high-frequency conductivity of the organic metals β-(BEDT-TTF)2SF5RSO3 (R = CH2CF2 and CHF)

Research output: Contribution to journalResearch articleContributedpeer-review


  • M. Glied - , University of Stuttgart (Author)
  • S. Yasin - , University of Stuttgart (Author)
  • S. Kaiser - , University of Stuttgart (Author)
  • N. Drichko - , University of Stuttgart (Author)
  • M. Dressel - , University of Stuttgart (Author)
  • J. Wosnitza - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • J. A. Schlueter - , Argonne National Laboratory (Author)
  • G. L. Gard - , Portland State University (Author)


The temperature dependences of the electric-transport properties of the two-dimensional organic conductors β-(BEDT-TTF)2SF5CH2CF2SO3, β-(d8-BEDT-TTF)2SF5CH2CF2SO3, and β-(d8-BEDT-TTF)2SF5CH2CF2SO3 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 β-(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 β-(BEDT-TTF)2SF5CH2CF2SO3, for instance, charge fluctuations cause an increase in microwave resistivity for T < 20 K which is not detected in dc measurements. β-(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.


Original languageEnglish
Pages (from-to)1043-1049
Number of pages7
JournalSynthetic metals
Issue number11
Publication statusPublished - Jun 2009
Externally publishedYes

External IDs

ORCID /0000-0001-9862-2788/work/142255398



  • Electron phase diagrams and phase transitions in model systems, Metal-insulator transitions and other electronic, Non-Fermi-liquid ground states, Organic superconductors

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