Ultrasonic attenuation of surface acoustic waves in thin films of high transition temperature superconducting Nb/sub 3/Sn and NbN
Thesis/Dissertation
·
OSTI ID:5488186
The ultrasonic attenuation of 600-700 MHz surface acoustic waves by two high T/sub c/, cubic crystal structure, superconducting thin films has been investigated. The films studied were two, 0.5 ..mu.. thin, Nb/sub 3/Sn samples, electron-beam codeposited on LiNbO/sub 3/ and Quartz, and eleven NbN samples from 3 x 10/sup 3/ angstrom to less than or equal to 200 angstrom thin, sputter deposited on LiNbO/sub 3/. The Nb/sub 3/Sn (A15 structure) film on Quartz was difficult to measure due to defects in the Quartz caused by the high deposition temperature (approx. =700/sup 0/C) used to make the high T/sub c/ form of the compound. The Nb/sub 3/Sn film on LiNbO/sub 3/, however, provided information about the transition temperature and energy gap at T = 0 K when the attenuation was measured as a function of temperature in zero magnetic field. A theory is developed to predict the electron-phonon produced normal state attenuation of surface acoustic waves by a thin, loss producing film on a nonattenuating substrate. Using a viscous drag model for the attentuation, the predictions of the theory are compared to the measured normal state attenuation to find the electron mean-free-path for the Nb/sub 3/Sn film on LiNbO/sub 3/.
- Research Organization:
- Wisconsin Univ., Milwaukee (USA)
- OSTI ID:
- 5488186
- Country of Publication:
- United States
- Language:
- English
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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
ACOUSTIC MEASUREMENTS
ACOUSTIC TESTING
ALLOYS
ATTENUATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
MATERIALS TESTING
NIOBIUM ALLOYS
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
NONDESTRUCTIVE TESTING
PHYSICAL PROPERTIES
PNICTIDES
SOUND WAVES
SPUTTERING
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SURFACE PROPERTIES
TESTING
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRASONIC TESTING
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACOUSTIC MEASUREMENTS
ACOUSTIC TESTING
ALLOYS
ATTENUATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
MATERIALS TESTING
NIOBIUM ALLOYS
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
NONDESTRUCTIVE TESTING
PHYSICAL PROPERTIES
PNICTIDES
SOUND WAVES
SPUTTERING
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SURFACE PROPERTIES
TESTING
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRASONIC TESTING