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Ultrasonic-attenuation investigation of the mixed state in three vanadium samples of varying purity

Journal Article · · Phys. Rev., B; (United States)
; ; ;
Ultrasonic-attenuation measurements were performed in three single-crystal vanadium samples, with resistivity ratios of 7.8, 245, and 450 as a function of magnetic field and temperature. Measurements obtained as a function of applied magnetic field were compared to the theoretical predictions of Houghton and Maki (HM) for the region near H/sub c//sub 2/. Because of the varying purity of the samples, the HM predictions for the dependence of the normalized attenuation on mean free path were also tested. In all cases, the experimental results were in good qualitative agreement with the HM predictions. Ultrasonic-attenuation measurements as a function of temperature compared well to the BCS theory and yielded critical temperatures of 4.69, 5.26, and 5.27 degreeK with corresponding zero temperature energy gaps of 2..delta.. (0)/kT/sub c/ = 3.6, 3.6, and 3.5 in order of increasing sample purity.
Research Organization:
Department of Physics, University of Wisconsin: Milwaukee, Milwaukee, Wisconsin 53201
OSTI ID:
7317820
Journal Information:
Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 15:5; ISSN PLRBA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
&amp; Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATTENUATION
BCS THEORY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
MAGNETIC FLUX
METALS
MIXED STATE
PHYSICAL PROPERTIES
SOUND WAVES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
ULTRASONIC WAVES
VANADIUM