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Time Resolved Magneto-Optical Imaging in High Frequency AC Currents of YBa2Cu3O7-&[delta] Thin Films

Published online by Cambridge University Press:  01 February 2011

Andrea Lucarelli ,
Alexander Frey ,
Ran Yang ,
Gunter Luepke ,
Timothy J Haugan ,
George A Levin  and
Paul N Barnes
Andrea Lucarelli
Affiliation:
axluca@wm.edu, College of William and Mary, Applied Science, 331, McGlothlin Street Hall, Williamsburg, VA, 23187, United States, 757 221 2503, 757 221 2050
Alexander Frey
Affiliation:
axfrey@wm.edu, College of William and Mary, Applied Science, Williamsburg, VA, 23187, United States
Ran Yang
Affiliation:
rxyan2@wm.edu, College of William and Mary, Applied Science, Williamsburg, VA, 23187, United States
Gunter Luepke
Affiliation:
luepke@jlab.org, College of William and Mary, Applied Science, Williamsburg, VA, 23187, United States
Timothy J Haugan
Affiliation:
timothy.haugan@wpafb.af.mil, Air Force Research Laboratory, Wright-Patterson, Ohio, 45433-7919, United States
George A Levin
Affiliation:
geroge.levin@wpafb.af.mil, Air Force Research Laboratory, Wright-Patterson, Ohio, 45433-7919, United States
Paul N Barnes
Affiliation:
paul.barnes@wpafb.af.mil, Air Force Research Laboratory, Wright-Patterson, Ohio, 45433-7919, United States
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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-d (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.

Keywords

superconductingmagnetoopticlaser
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 946: Symposium HH – Recent Advances in Superconductivity , 2006 , 0946-HH10-09
Copyright
Copyright © Materials Research Society 2006

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