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A number of high-melting-point rare-earth compounds have been examined for superconductivity. In this work LaC2, LuC2, and YGa2 were found to be superconductors, but Y3C, LaGa2, La5Sn3, and Y5Sn3 did not exhibit superconductivity in tests down to 1.4 K.
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Green et al. (1969) studied this question.
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