Time Resolved Magneto-Optical Imaging in High Frequency AC Currents of YBa2Cu3O7-Delta Thin Films (Postprint)

Abstract

We present a time-resolved magneto-optical (MO) imaging study of high-temperature superconductor (HTS) in high-frequency alternating current (AC) regime. The evolution of the magnetic flux density distribution in YBa2Cu3O7-delta (YBCO) thin film samples is studied in small steps of the phase of the applied AC current. The flux distribution at 10 K exhibits instabilities including flux jumps and flux creep. A quantitative analysis of the data allows us to obtain the current density evolution. The current profile changes considerably with the phase differently from the prediction of the critical state model. These observations can be explained by the higher self-field at the sample edge and the effects of flux creep.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2006
Accession Number
ADA562252

Entities

People

  • Alexander Frey
  • Andrea Lucarelli
  • George A. Levin
  • Gunter Luepke
  • Paul N. Barnes
  • Ran Yang
  • Timothy J. Haugan

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Charge Coupled Devices
  • Current Density
  • Electric Fields
  • Energy
  • Films
  • Flux Density
  • Frequency
  • Instability
  • Magnetic Fields
  • Magnetic Flux
  • Materials
  • Personal Information Managers
  • Superconductors
  • Thin Films

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Superconducting Magnet Technology