J. Phys. IV France 114 (2004) 107
Non magnetic anion substitution in (TMTSF) 2ClO 4: Consequences on the superconductivityN. Joo1, 2, C. Pasquier1, P. Auban Senzier1, D. Jérome1 and K. Bechgaard3
1 Laboratoire de Physique des Solides, Bât. 510, Université Paris-Sud, 91405 Orsay, France
2 Faculté des Sciences de Tunis, LPMC, Campus Universitaire, 1060 Tunis, Tunisie
3 Department of Solid State Physics, Risø National Laboratory, 4000 Roskilde, Denmark
Non magnetic impurities substitution is a method to check the microscopic origin of superconductivity. In (TMTSF) 2ClO 4, we substitute a small fraction of the ClO 4 anions by ReO 4. The anion ordering temperature is shown to be unaffected by alloying in the explored range 0-3.1%. However, the critical temperature is strongly reduced with increased residual resistivity obtained through alloying and/or increased speed of cooling. Our results are compatible with an unconventional superconductivity in the Bechgaard salts. Key words. Bechgaard salts - unconventional superconductivity - alloys.
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