Surface Wave Characterization of High Tc Superconductors
Abstract
High Tc superconducting controlling elements for frequency tunable surface acoustic wave SAW filters and dispersion lines in the 0.5 to 4 GHz range have been proposed and designed. Ultrasonic attenuation and velocity measurements in sinter forged YBa2Cu3O7 indicate that the sound waves are interacting with excitations which are confined to the CuO planes. Proximity SAW coupling to a two-dimensional electron gas 2 DEG has placed limits on the localization lengths of the 2 DEG. A new phase transition has been ultrasonically discovered in the mixed state of the heavy Fermion superconductor UPt3. An anomalous increase in attenuation in the superconducting state of the reentrant superconductor system Er(1-x)Ho(x)Rh(4)B4 implies a novel interaction mechanism in this system. SAW measurements on granular superconducting films demonstrate that SAW measure the sheet resistivity of these films on a length scale comparable to the SAW wavelength. Keywords: Superconductors; Surface acoustic waves; Electron gas; Heavy fermion superconductors; Reentrant superconductors; Granular superconducting film.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 26, 1990
- Accession Number
- ADA221077
Entities
Organizations
- University of Wisconsin–Milwaukee