Abstract

We discuss the possible occurrence, or absence, of superconductivity in various categories of organic metals, based on a pairing mechanism of conduction electrons due to indirect exchange interactions between them, mediated by sulphur or selenium atoms. Within this mechanism the organic superconductors are analogous to the high- T c cuprates and the alkali-doped buckminster-fullerenes C 60, in that specific diamagnetic units mediate pairing of conduction electrons, in the s-wave channel, in all of them. The diamagnetic units are the oxygen anions in the cuprates and the carboncarbon double bonds in the fullerenes. In the organics we show that S and Se are the relevant diamagnetic units rather than O atoms or CC double bonds. This is in striking agreement with the fact that all known organic superconductors contain either S or Se and sometimes both.

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