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Asymmetric critical currents of Nb and YBCO thin films for the polarity of the transport current in parallel magnetic fields

✍ Scribed by F. Ichikawa; T. Nishizaki; K. Yamabe; Y. Yamasaki; T. Fukami; T. Aomine

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 154 KB
Volume: 235-240
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(94)91074-x

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✦ Synopsis

In order to investigate a surface effect on flux pinning, transport critical currents J¢ of Nb and YBa2Cu3Ov_z thin films have been measured in magnetic fields B parallel to the surface. It is found that in both fihns the magnitude of Jc changes when tile direction of the Lorentz force is reversed. The "larger" J¢ produces the Lorentz force pushing the flux through tlle surface from the outside of the film to the interior. Furthermore, the "larger" Jc(B) exhibits a broad peak at a finite B value. The origin of the asymmetry is discussed on the basis of a potential acting on vortices in the thin films.

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