Ultrasonic attenuation in normal and superconducting indium

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5157950

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 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 comparison of the measured dislocation attenuations with those predicted by the theory of Granato and Luecke 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 Luecke theory of dislocation attenuation are shown to be insufficient tests of that theory.

• Research Organization: Pennsylvania State Univ., University Park (USA)
• OSTI ID: 5157950
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
656102* -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATTENUATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
INDIUM
METALS
PHYSICAL PROPERTIES
SOUND WAVES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
ULTRASONIC WAVES