Tunneling. cap alpha. /sup 2/F(. omega. ) as a function of composition in A15 V-Si
High-quality A15 V-Si/SiO/sub x//Pb tunnel junctions on electron-beam codeposited V/sub 3/Si have been fabricated. 2..delta../k/sub B/T/sub c/ remains near the weak-coupled Bardeen-Cooper-Schrieffer limit as stoichiometry is approached. These junctions have satisfactory characteristics for taking derivative measurements. The data were reduced with use of the modified McMillan-Rowell proximity-gap inversion analysis developed by Arnold and Wolf to generate ..cap alpha../sup 2/F(..omega..) and related microscopic parameters. As T/sub c/ and the gap increase, there is no evidence of any qualitative change in the phonon spectra (such as phonon mode softening seen in other A15 compounds). Thus while in other A15 compounds such as Nb/sub 3/Ge, Nb/sub 3/Al, and Nb/sub 3/Sn there is evidence that mode softening is a major factor in the high transition temperatures, in V/sub 3/Si the high density of states at the Fermi surface (and not mode softening) is probably primarily responsible for the high T/sub c/.
- Research Organization:
- Naval Research Laboratory (Code 6634), Washington, D.C. 20375
- OSTI ID:
- 5455827
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 32:5; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAMS
BETA-W LATTICES
CHALCOGENIDES
COATINGS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON BEAMS
ELEMENTS
EXPERIMENTAL DATA
HIGH VACUUM
INFORMATION
JUNCTIONS
LEAD
LEPTON BEAMS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHONONS
PHYSICAL PROPERTIES
PROXIMITY EFFECT
QUANTITY RATIO
QUASI PARTICLES
SILICIDES
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SUPERCONDUCTING JUNCTIONS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
VANADIUM COMPOUNDS
VANADIUM SILICIDES
VAPOR DEPOSITED COATINGS