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The effect of irradiation-induced disorder on the conductivity and critical temperature of the organic superconductor $κ$-(BEDT-TTF)$_2$Cu(SCN)$_2$

James G. Analytis·Arzhang Ardavan·Stephen J. Blundell·Robin L. Owen·Elspeth F. Garman·Chris Jeynes·Ben J. Powell
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Abstract

We have introduced defects into clean samples of the organic superconductor $κ$-(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.

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James G. Analytis, Arzhang Ardavan, Stephen J. Blundell, Robin L. Owen, Elspeth F. Garman, Chris Jeynes, Ben J. Powell. 2005-12-16. The effect of irradiation-induced disorder on the conductivity and critical temperature of the organic superconductor $κ$-(BEDT-TTF)$_2$Cu(SCN)$_2$. https://doi.org/10.1103/physrevlett.96.177002

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