Collective modes with a sound spectrum in layered superconductors
Robert A. Vardanian
DOI 10.1103/PhysRevB.51.15286 · Physical Review B
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Abstract
The collective-mode spectrum for a layered superconductor is considered here. The Hamiltonian describes electrons in a metallic layer in the effective-mass approximation and the coupling of neighboring layers by a Josephson-type term. In this model, electrodynamic equations are obtained that are valid in the whole range of the nonmagnetic-impurities concentration. The velocity values of collective modes for two principal directions of the wave vector (along and across the superlattice axis) are found.
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