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MEASUREMENT OF THE SUPERCONDUCTING ENERGY GAP FOR VANADIUM BY MEANS OF ULTRASONIC TECHNIQUES. Thesis

Thesis/Dissertation ·
OSTI ID:4123977
The ultrasonic attenuation of a hard superconductor, vanadium, was measured for the frequency range of 46 to 437 MC in the superconducting state, using the single pulse comparison technique and electronic control of the sample temperature. The observed attenuation data could be fitted throughout the temperature region with the equation alpha /sub s// alpha /sub n/ = (2)/(e/sup EPSILON /kT/ + 1). An energy gap of 3.35 plus or minus kT/sub c/ at absolute zero was obtained. The ultrasonic attenuation was observed to have a square-law dependence on frequency, indicating that ql << 1, where q is the elastic propagation constant and l the electronic mean free path. /sub c/ found to be about 4.54 deg K and dH/sub c//dT about 200 gauss/deg K. A transition width of 0.11 deg K was observed, using a-c measuring techniques. Simultaneous ultrasonic attenuation measurements indicated that the bulk effect in the transition region was small. (Dissertation Abstr., 24: No. 4, Oct. 1983.)
Research Organization:
Originating Research Org. not identified
NSA Number:
NSA-18-004501
OSTI ID:
4123977
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ATTENUATION
CONTROL
CURRENTS
ELECTRONIC EQUIPMENT
ENERGY LEVELS
FREQUENCY
HARDNESS
LOSSES
LOW TEMPERATURE
MAGNETIC FIELDS
MEASURED VALUES
PERFORMANCE
PHYSICS
PULSES
SUPERCONDUCTIVITY
TEMPERATURE
TRANSIENTS
TRANSITION TEMPERATURE
ULTRASONICS
VANADIUM