Abstract
Synopsis The attenuation of ultrasonic shear waves with frequencies between 2.5 MHz and 25 MHz has been measured in two single crystals of superconducting aluminium for different polarization directions. At the transition temperature a steep although continuous drop of the attenuation was observed. The remaining part of the attenuation fits quite well into the BCS-theory. No anisotropy has been found for the zero-temperature energy gap, but the shapes of the attenuation-versus-temperature curves are strongly orientation-dependent. Some measurements have also been performed at small magnetic fields.
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