The effect of irradiation-induced disorder on the conductivity and critical temperature of the organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂
Analytis, James G. · Ardavan, Arzhang · Blundell, Stephen J. · Owen, Robin L. · Garman, Elspeth F. · Jeynes, Chris · Powell, Ben J.
Original · EN
We have introduced defects into clean samples of the organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂ in order to determine their effect on the temperature dependence of the conductivity and the critical temperature T 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 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.
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