Superconductivity in the Organic Charge Transfer Salts: (TMTSF)2X and (TMTTF)2X |
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| Authors: | S.S.P. Parkin F. Creuzet M. Ribault D. Jérome K. Bechgaard J. M. Fabre |
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| Affiliation: | 1. Laboratoire de Physique des Solides Universite Paris-Sud , Bǎtiment 510, 91405, Orsay, France;2. Cavendish Laboratory , Madingley Road, Cambridge, England;3. Laboratoire de Physique des Solides Universite Paris-Sud , Bǎtiment 510, 91405, Orsay, France;4. H.C. Oersted Institute Universitetsparken , 5 DK 2100, Copenhagen, Denmark;5. Laboratoire de Chimie Organique Structurale USTL , 34060, Montpellier, France |
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| Abstract: | Abstract We report pressure dependent studies of the a-axis resistivity as a function of temperature for several members of the isostructural families of organic charge transfer salts, (TMTSF)2X and (TMTTF) 2X. For a typical (TMTSF)2X material the low temperature metal-insulator transition seen at 1 bar is suppressed above some critical pressure, Pc, where a superconducting transition is observed near 1 K. We find a correlation between Pc and the ambient pressure c lattice parameter which reflects the anion size. The (TMTTF) cX salts exhibit very different ambient pressure behaviour but we find that with the application of sufficiently high pressures (～30 kbar) their behaviour resembles that seen in the (TMTSF)2X family but at lower pressures. In particular we find evidence of a possible superconducting transition near 4 K in (TMTTF)2Br at 25 kbar. At this pressure the conductivity near 4 K is extremely high with a value approaching 106 (Ωcm)?1 and the resistivity ratio is about 400. |
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| Keywords: | Electronic structure K3Ba3C60 Rb3Ba3360 superconductivity Density-Functional Theory |
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