Effect of irradiation-induced disorder on the conductivity and critical temperature of the organic superconductor kappa-(BEDT-TTF)(2)Cu(SCN)(2)

TitleEffect of irradiation-induced disorder on the conductivity and critical temperature of the organic superconductor kappa-(BEDT-TTF)(2)Cu(SCN)(2)
Publication TypeJournal Article
Year of Publication2006
AuthorsAnalytis, J. G., Ardavan A., Blundell S. J., Owen R. L., Garman E. F., Jeynes C., and Powell Ben J.
JournalPhysical Review Letters
Volume96
Issue17
Pagination177002
AbstractWe 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 interlayer conductivity sigma and the critical temperature T-c. We find a violation of Matthiessen's rule that can be explained by a model of sigma involving a defect-assisted interlayer channel which acts in parallel with the bandlike conductivity. We observe an unusual dependence of T-c on residual resistivity, inconsistent with the generalized Abrikosov-Gor'kov theory for an order parameter with a single component, providing an important constraint on models of the superconductivity in this material.