Ultrasonic attenuation of 700-MHz surface acoustic waves in thin films of superconducting NbN
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
The temperature dependence of the ultrasonic attenuation of 700-MHz surface acoustic waves has been measured for nine films of superconducting NbN varying in thickness from 0.02 to 0.3 ..mu..m. The films, sputter deposited on LiNbO/sub 3/ substrates, exhibited attenuation changes in the superconducting state which were very similar in each case. These changes did not, however, follow the predictions of Bardeen, Cooper, and Schrieffer. Instead, they began with a sharp decrease for 1 or 2 dB at the transition temperature followed by a leveling off which remained nearly constant until T< or approx. =0.5T/sub c/. It then decreased linearly with temperature until again leveling off below 1.5 K. A tentative explanation is proposed in terms of the Kosterlitz-Thouless vortex-antivortex theory.
- Research Organization:
- Physics Department, University of Wisconsin, Milwaukee, Wisconsin 53201
- OSTI ID:
- 6095832
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 27:5; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ATTENUATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
FREQUENCY RANGE
LITHIUM COMPOUNDS
MAGNETIC FLUX
MHZ RANGE
MHZ RANGE 100-1000
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SOUND WAVES
SPUTTERING
SUBSTRATES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC WAVES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ATTENUATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
FREQUENCY RANGE
LITHIUM COMPOUNDS
MAGNETIC FLUX
MHZ RANGE
MHZ RANGE 100-1000
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SOUND WAVES
SPUTTERING
SUBSTRATES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC WAVES