Abstract
The attenuation of longitudinal ultrasonic waves has been measured in spectroscopically pure single crystals of indium in the intermediate state over the frequency range of 10 to 30 MHz. It is shown that the total attenuation in the intermediate state can be divided into two parts. The superconducting layers give rise to the oscillatory temperature-dependent attenuation, while the normal layers and the boundary effect between the normal and superconducting layers produce a temperature-independent constant attenuation. A plausible explanation of the observed experimental results is discussed.
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