Physics – Condensed Matter – Superconductivity
Scientific paper
2005-07-27
Europhysics Letters 72 (22/09/2005) 645-651
Physics
Condensed Matter
Superconductivity
7 pages format EPL
Scientific paper
10.1209/epl/i2005-10281-1
The study of the anion ordered (TMTSF)\_2ClO\_4\_(1-x)ReO\_4\_x, solid solution in the limit of a low ReO\_4- substitution level (0<=x<=17%) has revealed a new and interesting phase diagram. Superconductivity is drastically suppressed as the effect of ReO\_4- non magnetic point defects increases following the digamma behaviour for usual superconductors in the presence of paramagnetic impurities. Then, no long range order can be stabilized above 0.1K in a narrow window of substitution. Finally, an insulating SDW ground state in ReO\_4- -rich samples is rapidly stabilized with the decrease of the potential strength leading to the doubling of the transverse periodicity. This extensive study has shown that the superconducting order parameter must change its sign over the Fermi surface.
Auban-Senzier Pascale
Bechgaard Klaus
Jerome Denis
Joo Nada
Pasquier Claude
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