Variation of vortex structure characteristics of Bi-2223/Ag superconducting tapes with respect to applied magnetic field direction

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• 作者：F. Oemry ; M. Diantoro ; I.M. Sutjahja ; M.O. Tjia ; L. Kopera ; G.M.J. Bonfait and P. Kovac
• 刊名：Physica C
• 出版年：2005
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：2005
• 卷：426-431
• 期：Part 1
• 页码：396-401
• 文件大小：224 K

摘要

A study of the effects of external magnetic field orientation on the vortex characteristics was performed on a Bi-2223/Ag superconducting tape prepared by powder in tube method incorporating two-axial rolling and eccentric rolling processes. The data used for the analysis were obtained by magnetoresistance measurements in external magnetic field ranging from 0 to 16 T, at field orientations of 0°, 25°, 45°, 60°, and 90° with respect to the broad face of the tape. It is shown that the H_irr and H_TAFF phase boundaries tend to shift to lower temperature region with increasing field angle. On the other hand, the H_FF curves remain roughly unaffected, leading to broadening of the unpinned liquid phase region between the H_TAFF and H_FF curves. Further analysis of the H_irr(T) data for θ = 90° on the basis of Kim’s model of pancake depinning has yielded a whole set of vortex parameters and H_c2 (θ).