Abstract

The heat capacity of a metal is made up of the electronic and lattice contributions: c = c el + c 1at. In usual superconductors, the superconducting transition has practically no effect on the lattice. As is known from the theory of normal metals, at low temperatures the dependence of the lattice heat capacity on temperature is given by c lat ~ T 3. The same dependence characterizes C lat s in the superconducting state. In contrast, the electronic contribution changes drastically following the transition. We mentioned earlier (Chapter 1) that C el s is observed to decay exponentially as T → 0. This behavior is explained by the theory of superconductivity as follows.

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