Suppression of superconductivity by non-magnetic disorder in the organic superconductor $\mathsf{(TMTSF)_{2}(ClO_{4})_{(1-x)}(ReO_{4})_{x}}$

We present a study of the superconducting properties (T c and H c2 ) in the solid solution ${\rm (TMTSF)_{2}(ClO}_{4})_{(1-x)}{\rm (ReO_{4})}_{x}$ , with a $\rm ReO_{4}^{-}$ nominal concentration up to $x=6\%$ . The dramatic suppression of T c when the residual resistivity is increased upon alloying with no modification of the Fermi surface is the signature of non-conventional superconductivity. This behaviour strongly supports p or d wave pairing in quasi one dimensional organic superconductors. The determination of the electron lifetime in the normal state at low temperature confirms that a single particle Drude model is unable to explain the temperature dependence of the conductivity and that a very narrow zero frequency mode must be taken into account for the interpretation of the transport properties. Copyright Springer-Verlag Berlin/Heidelberg 2004