Accession Number:
ADA190417
Title:
Thin Superconducting Film Characterization by Surface Acoustic Waves
Descriptive Note:
Annual progress rept. 30 Sep 86-30 Sep 87
Corporate Author:
WISCONSIN UNIV-MADISON DEPT OF PHYSICS
Personal Author(s):
Report Date:
1987-10-30
Pagination or Media Count:
15.0
Abstract:
A dilution refrigerator was installed tested and modified. Several cryogenic probes were fabricated to measure resistivity, ac susceptibility and ultrasonic attenuation in high T superconductors. Ultrasonic attenuation measurements were performed on single crystals of UPt3 and URu2Si2. A maximum in attenuation was found below the superconducting transition temperature TC of URu2Si2. A magnetic field decreased this maximum. The temperature of the attenuation in the normal and superconducting states below Tc was measured in UPt3. The ratio of the attenuation follows a power law dependence indicative of an anisotropic superconducting energy gap. A peak in attenuation was found in the mixed state of UPt3, which may be associated with a phase transition of the flux line lattice.
Descriptors:
- *PHASE TRANSFORMATIONS
- *SUPERCONDUCTORS
- *THIN FILMS
- *CRYOGENICS
- *SUPERCONDUCTIVITY
- *REFRIGERATION SYSTEMS
- MEASUREMENT
- PROBES
- RATIOS
- MAGNETIC FIELDS
- ENERGY GAPS
- ALTERNATING CURRENT
- TRANSITION TEMPERATURE
- ANISOTROPY
- ATTENUATION
- POWER
- ACOUSTIC ATTENUATION
- SEMICONDUCTING FILMS
- DILUTION
- SURFACE ACOUSTIC WAVES
Subject Categories:
- Thermodynamics