ULTRASONIC DETERMINATION OF THE SUPERCONDUCTING ENERGY GAP IN TANTALUM

Journal Article · Fri Nov 01 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.132.1073· OSTI ID:4697900

Levy, M; Rudnick, I

Ultrasonic measurements were performed on two single crystals of tantalum axially oriented on (110). The temperature dependence of the attenuation coefficient of longitudinal waves propagating in this direction was used to compute the temperature dependence of the superconducting energy gap of tantalum. It was found to be closely predicted by the Bardeen-Cooper-Schrieffer theory. The zerotemperature energy gaps of the two were (3.4 plus or minus 0.2)kT/sub c/ and (3.5 plus or minus 0.2)kT/sub c/, respectively, which are compatible with BCS result, 2 epsilon /sub O/) = 3.5 kT/sub c/. In the frequency range of these experiments, 45 to 340 Mc ql was smaller than one. (auth)

• Research Organization: Univ. of California, Los Angeles
• NSA Number: NSA-17-041623
• OSTI ID: 4697900
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 132; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BCS THEORY
CRYSTALS
ELECTRONS
ENERGY
ENERGY LEVELS
FREQUENCY
MEAN FREE PATH
MEASURED VALUES
MONOCRYSTALS
PHYSICS
SUPERCONDUCTIVITY
TANTALUM
TEMPERATURE
ULTRASONICS