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Abstract Detailed measurements have been made of the superconducting transition temperatures and critical magnetic fields of the tin isotopes of mass 116, 120 and 124. The transition temperature varies with isotopic mass according to the law T c ∞ M − n , with n = 0·462 ± 0·014, a result very similar to that already found in mercury. The critical field curves of isotopes 116 and 124 are geometrically similar, in the sense that both many be represented by the same equation, H c / H o = f ( T / T c ), with the same ratio H o / T c for both. It is deduced that the electronic specific heat in normal tin varies only slowly, if at all, with isotopic mass. The variation of T c and H o with M is very close to that predicted by Fröhlich and Bardeen.
Lock et al. (Mon,) studied this question.