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VOLUME 30 (1979) | ISSUE 3 | PAGE 185
Geometrical resonance in an intermediate state of superconductors
We consider the absorption of ultrasound (geometrical resonance) in an intermediate state with kaN>l. We obtain an amplitude-modulated oscillatory dependence of the absorption as a consequence of Andreev reflections of electron excitations from the boundaries of normal and superconducting layers. It can be shown that this function explains the experiments in Refs. 1 and 2.