Effects of Magnetic Field and Temperature on the Critical Current Hysteresis in Tl-Ca-Ba-Cu-O Thin Films

The behavior of the critical current density of Tl-Ca-Ba-Cu-O superconducting thin films in a cycling magnetic field was investigated. The hysteresis of the transport J c manifested similar features to those found in polycrystalline Y-Ba-Cu-O and granular Nb, Al thin films in zero-field cooling. How...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1990-11, Vol.29 (11A), p.L2037-L2040
Main Authors: Chang, Hung-Lun, Juang, Jenh-Yih, Liou, Sy-Hwang, Uen, Tzeng-Ming, Gou, Yih-Shun
Format: Article
Language:English
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Summary:The behavior of the critical current density of Tl-Ca-Ba-Cu-O superconducting thin films in a cycling magnetic field was investigated. The hysteresis of the transport J c manifested similar features to those found in polycrystalline Y-Ba-Cu-O and granular Nb, Al thin films in zero-field cooling. However, a novel result of the transport J c in field-cooled samples has been observed. The results were attributed to the presence of a saturated trapped magnetic flux in the weaklink network. The effects of temperature on both the trapped flux and the transport J c suggest the existence of various states of the trapped flux in the Tl-based superconducting thin films.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.29.L2037