Accession Number:

ADA458784

Title:

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

Descriptive Note:

Journal article

Corporate Author:

CALIFORNIA STATE UNIV NORTHRIDGE DEPT OF PHYSICS AND ASTRONOMY

Report Date:

2004-12-01

Pagination or Media Count:

7.0

Abstract:

We have studied the local transport properties in an epitaxial YBa2Cu3O7-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 Tc is not large enough to be detected by other localized compositional and structural characterization techniques, this along with an area of lower Tc andor 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 andor oxidation of the YBCO film.

Subject Categories:

  • Inorganic Chemistry
  • Fluid Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE