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Imaging transport current distribution in high temperature superconductors using room temperature scanning laser microscope

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5 Author(s)
Klein, B.E. ; Department of Physics and Astronomy, California State University Long Beach, Long Beach, California 90840 ; Seo, S. ; Kwon, C. ; Park, B.H.
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We report the feasibility of room temperature scanning laser microscopy (RTSLM) for the study of high temperature superconducting films. RTSLM images from SmBa2Cu3O7 and YBa2Cu3O7 thin films show that the ac voltage response exists only in the section of the bridge where the transport current produces a voltage drop. A photolithographically defined 60 μm×60 μm void in a 300-μm-wide bridge was clearly visible in a RTSLM image giving the spatial resolution smaller than 60 μm. In addition, the void disturbs the transport current distribution beyond itself generating an elongated shape void of 64 μm×85 μm with the longer side along the direction of current flow in the RTSLM image. Our results indicate that the RTSLM is a useful tool for investigating the transport current distribution in high temperature superconductors. © 2002 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:73 ,  Issue: 10 )

Date of Publication:

Oct 2002

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