The Attenuation of Sound, ql > 1, in Niobium at Low Flux Densities
In this paper we report some measurements of the attenuation of longitudinal and transverse sound waves in the mixed state of niobium at high frequencies where ql >1 in both the normal and superconducting states. We have concentrated on the behavior at relatively low fields, well below H c2 , where, as a first approximation, we can consider two independent contributions to the attenuation, one arising from the excitations bound to the flux lines and the other from the BCS-like unbound excitations which are scattered by the flux lines.
KeywordsLongitudinal Wave Free Path Mixed State Superconducting State Attractive Interaction
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