Abstract
Measurements have been made on the attenuation of 10-, 30-, and 50-MHz longitudinal sound waves in normal and superconducting molybdenum single crystals. These measurements were made for the ultrasound propagated in the [100], [110], and [111] directions. The measured attenuation changes have been analyzed in terms of the BCS theory of superconductivity. An effective minimum energy gap has been determined and has been found to be anisotropic. We have also observed a frequency-dependent behavior in the measured values of the ratio of the ultrasonic attenuation in the superconducting state over that in the normal state $\frac{{\ensuremath{\alpha}}_{s}}{{\ensuremath{\alpha}}_{n}}$ and hence in the values of the energy gap $\ensuremath{\Delta}(T)$, calculated by fitting the data to the BCS model.
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