Magnetic properties of pure and irradiated TMTSeF-DMTCNQ

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Abstract
E.P.R. experiments have been performed on pure and irradiated TMTSeF-DMTCNQ between 5 and 300 K. The analysis of the low temperature upturn in the magnetic susceptibility of samples irradiated up to concentrations of several percent, has revealed a Curie behaviour from 5 K to 30 K and confirmed that the number of localized spins are of the same order as the number of irradiation defects counted as high potentials interrupting the conducting chains. This is a further justification of a model of magnetic segments. The thermal variations of the linewidth on the pure organic conductor confirm that this compound behaves at high temperature more like a single chain compound than like a usual two chains compound i.e., a charge transfer complex. The absence of superconductivity in the present samples of TMTSeF-DMTCNQ could be attributed to the presence of magnetic impurities on the DMTCNQ chains