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

Authors

Hung-Lun Chang, Institute of Electro-Optical Engineering, National Chiao Tung University
Jenh-Yih Juang, Institute of Electrophysics, National Chiao Tung University
Sy_Hwang Liou, University of Nebraska-LincolnFollow
Tzeng-Ming Uen, Institute of Electrophysics, National Chiao Tung University
Yih-Shun Gou, University of Nebraska - Lincoln

Date of this Version

November 1990

Comments

Published by American Institute of Physics. Jpn. J. Appl. Phys., 29, L2037 (1990). © 1990 American Institute of Physics. Permission to use. http://jjap.ipap.jp/.

Abstract

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.