Ultrasonic attenuation in normal and superconducting indium. Technical memo. for period ending aug 80

Technical Report · Thu May 22 04:00:00 EDT 1980

OSTI ID:6359504

Conley, M P

The dependence of ultrasonic attenuation on temperature, sonic frequency, propagation direction, and superconducting state has been measured in indium single crystals using low-amplitude longitudinal waves. These measurements and the experimental apparatus with which they have been obtained are described. These data indicate that, in addition to the usual electronic attenuation described quantitatively by the BCS theory of superconductivity (Bardeen et al., Phys. Rev. 108, 1175), there is an additional source of attenuation. This secondary attenuation is generally attributed to the interaction of sound waves and crystal dislocations within the specimen, a process which has been described most thoroughly by Granato and Lucke (J. Appl. Phys. 27, 583). A comparison of the measured dislocation attenuations with those predicted by the theory of Granato and Lucke is given. This theory is shown to be inapplicable to the situation of this experiment, i.e., to indium at low temperatures. Earlier works in which similar data appear to substantiate the Granato and Lucke theory of dislocation attenuation are shown to be insufficient tests of that theory.

• Research Organization: Pennsylvania State Univ., University Park (USA). Applied Research Lab.
• OSTI ID: 6359504
• Report Number(s): AD-A-091605
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATTENUATION
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
INDIUM
METALS
MONOCRYSTALS
ORIENTATION
PHYSICAL PROPERTIES
SOUND WAVES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
ULTRASONIC WAVES