Abstract
The attenuation of Longitudinal ultrasonic waves has been measured in single crystals of indium (99.999%) and of indium doped with 0.003 a % of tin in the intermediate state over the frequency range 10--30 MHz. Two phase have been identified in the superconducting layers. The fundamental frequency for one phase is approximately constant in both the specimens for the same field, but increases appreciably with the increase in the magnetic field from 0.7 H/sub c/ to 0.9 H/sub c/; the ..nu../sub 0/ value for the other phase, on the other hand, increases with increase in the concentration of the dopant and is independent of the magnetic field. The orgin of the two phases is discussed.
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