INTERNAL FRICTION AT kHz-FREQUENCIES IN SUPERCONDUCTORS NEAR THE CRITICAL TEMPERATURE

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Abstract
An internal-friction peak, generally 0.1-1.0K wide, independent of frequency and amplitude, centred at Tc, and associated with the presence of dislocations, has been reported for lead, tantalum, niobium and other metals and alloys. Its characteristics are shown to be explicable in terms of a hysteretic loss arising from the enhancement of the background internal friction, due to the association of edge dislocations with filaments of superconducting phase

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