Measurement and Analysis of the Microwave Surface Resistance in a Mixed Phase Y-Ba-Cu-O Superconductor

Abstract

Absolute microwave surface resistance of a mixed-phased YBCO 88K superconductor has been measured at 16.5 GHz over the temperature range from 6 to 90K. The data revealed at least 2 superconducting phases. A phase with lower transition temperature produces a residual surface resistance marked by a discontinuity in surface resistance versus temperature at 52K. This phase is apparently closely related to the '60K bulk' YBCO superconductor. An additional resistance discontinuity occurs at 83K. Microwave surface resistance is thus a diagnostic tool for multiphase superconductors. With recognition that mixed superconducting phases act as added residual resistances, the Mattis-Bardeen theory gives a good fit to the superconducting surface resistance for both phases.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1990
Accession Number
ADA230047

Entities

People

  • A. Drehman
  • C. Von Benken
  • John S. Derov
  • Peter J. Walsh
  • W. D. Cowan

Organizations

  • Rome Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Discontinuities
  • Films
  • Frequency
  • High Temperature
  • High Temperature Superconductors
  • Materials
  • Measurement
  • Microwaves
  • Phase
  • Phase Transformations
  • Residuals
  • Resistance
  • Resonant Frequency
  • Superconductors
  • Transition Temperature
  • Transitions

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Powder metallurgy of Titanium alloys.
  • Superconducting Magnet Technology