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Superconductivity in the Re/sub 1-x/Tc/sub x/Be/sub 22/ system
Five compositions of Re/sub 1-x/Tc/sub x/Be/sub 22/ with 0 less than or equal to x less than or equal to 1.0 were examined for superconductivity. The decrease in the superconducting transition temperature, T/sub c/, with increasing x was found to be proportional to the average atomic weight, M/sub a/, of Re/sub 1-x/Tc/sub x/. Using low-temperature specific heat measurements on the composition with x = 0.75, values of ..gamma.. and theta/sub D/ were determined and compared with published values for ReBe/sub 22/. The relatively small differences in these parameters and the strong influence of M/sub a/ on the T/sub c/ indicate that the superconductivity of these compounds is associated with the cubic symmetry and the vibrational modes of the Be sublattice. 2 figures, 3 tables