Superconductivity of the organic conductor, β-(BEDT-TTF)2I3 was studied by viewing the Hc2 and the efect of impurity by radiation and alloying. Benefited by the large pressure dependence of Tc, i.e. from 8 K to 1 K by 1-7 kbar, superconducting properties were examined as functions of Tc for the same superconductivity. We discuss the appearance of superconductivity in relation to low temperature resistivity.
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