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A semiempirical argument is presented which shows that for tin the lattice specific heat of the normal state is also present in the superconducting state. This result follows from the law of similarity for the threshold field curves. It is also shown that the so-called "electronic specific heat" of the superconducting state contains a large contribution from the motions of the ions in the lattice.
G. V. Chester (Thu,) studied this question.
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