Abstract
The acoustic resonance frequency and amplitude of spherical sintered polycrystalline specimens of ${\mathrm{BaPb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Bi}}_{\mathrm{x}}$${\mathrm{O}}_{3}$ (x=0.20 and 0.25) were measured as a function of temperature (300--4.2 K) and external magnetic field (0--5 T). The resonance amplitude was found to be dependent on the magnetic field and temperature; it changed drastically at the second critical magnetic field and at the critical temperature of the normal-superconducting transition. This effect is interpreted in terms of a model in which the electron-phonon coupling of the thermal phonons play an essential role in determining the amplitude of the resonance.
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