Internal friction in A15 and C15 superconductors in the temperature range 4-150K

Abstract

Measurements of the internal friction for the propagation of longitudinal ultrasonic waves in the kHz range have been made for samples of Nb₃Sn, V 25.25 at.% Si, HfV₂ and ZrV₂ all of which undergo lattice transformations above their superconducting transition temperatures. Large peaks in the internal friction are observed just below the lattice transformation temperatures of HfV₂ and ZrV₂, but not for Nb₃Sn and V 27.25 at.% Si, though the latter does exhibit a much smaller peak at a temperature above the transformation.