Effect of superconducting coating on the heat conductivity of a normal metal

General linear response quantum methods are used to find the temperature dependence of the electron heat conductivity of a film of a pure (l≫L, where l is the mean free path and L is the film thickness) normal metal between two thin superconducting layers of thickness d≪L. It is shown that the well-known Andreev total reflection of the electron excitations is accompanied by tunneling and above-barrier reflection whose partial probabilities are determined by the excitation energy and the thickness of the superconducting layer.

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