Thin Superconducting Film Characterization by Surface Acoustic Waves

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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 30, 1987
Accession Number
ADA190417

Entities

People

  • Moises Levy

Organizations

  • University of Wisconsin Madison Department of Physics

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Acoustic Waves
  • Critical Temperature
  • Electron Gas
  • Electrons
  • Energy Gaps
  • Films
  • Frequency
  • Hall Effect
  • Low Temperature
  • Magnetic Fields
  • Measurement
  • Phase Transformations
  • Superconductors
  • Surface Acoustic Waves
  • Transition Temperature
  • Transitions
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Structural Health Monitoring of Composite Structures.