Observation of Nonuniform Current Transport in Epitaxial YBa2Cu3O(7-x) Film Near the Superconducting Transition Temperature

Abstract

We have studied the local transport properties in an epitaxial YBa2Cu3O(7-x) (YBCO) film on LaAlO3 (LAO) using variable temperature scanning laser microscope (VTSLM) near the superconducting transition. A map of the superconducting transition temperature (Tc) is generated from a series of VTSLM images. The map of Tc indicates there are inhomogeneities in the film large enough to create nonuniform current flow near the superconducting transition. The evaluated Tc varies between 90.3 and 91.0 K in the film. Even though such change in T(*)c is not large enough to be detected by other localized compositional and structural characterization techniques, this along with an area of lower Tc and/or higher resistance affects current flow near the superconducting transition temperature as shown in VTSLM images. This inhomogeneity may be caused by slight variations of the stoichiometry and/or oxidation of the YBCO film.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2004
Accession Number
ADA458784

Entities

People

  • C. Kwon
  • J. L. Young
  • L. B. Wang
  • M. B. Price
  • Paul N. Barnes
  • Timothy J. Haugan

Organizations

  • California State University, Northridge

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Laser Beams
  • Laser Microscopy
  • Lasers
  • Measurement
  • Microscopes
  • Microscopy
  • Military Research
  • Nonuniform
  • Observation
  • Oxidation
  • Resistance
  • Scanning
  • Stoichiometry
  • Transition Temperature
  • Transport Ships

Fields of Study

  • Physics

Readers

  • Superconducting Magnet Technology
  • Thin Film Deposition Science.

Technology Areas

  • Directed Energy
  • Directed Energy - Pulsed-Laser Deposition