Abstract

The variation of the acoustic shear wave velocity with applied magnetic field in the mixed state of a type-II superconductor is studied theoretically on the basis of a phenomenological model in which the coupling between the flux line lattice and the crystal lattice via the pinning potential is taken into account in a consistent manner. The theory gives good agreement with the experimental results pertaining to shear waves in a superconducting alloy Nb-25% Zr. The frequency dependence of the fractional change in acoustic velocity is also accounted for.

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