Physics – Condensed Matter – Superconductivity
Scientific paper
2005-12-16
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevLett.96.177002
We have introduced defects into clean samples of the organic superconductor $\kappa$-(BEDT-TTF)$_2$Cu(SCN)$_2$ in order to determine their effect on the temperature dependence of the conductivity and the critical temperature $T_{\rm c}$. We find a violation of Matthiessen's rule that can be explained by a model of the conductivity involving a defect-assisted interlayer channel which acts in parallel with the band-like conductivity. We observe an unusual dependence of $T_{\rm c}$ on residual resistivity which is not consistent with the generalised Abrikosov-Gor'kov theory for an order parameter with a single component, providing an important constraint on models of the superconductivity in this material.
Analytis James G.
Ardavan Arzhang
Blundell Stephen J.
Garman Elspeth F.
Jeynes Chris
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