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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Penetration and trapping of the magnetic flux in planar defects of Bi1.65Pb0.35Sr2Ca2+xCu3+xOy superconductors

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Hernandez-Wolpez, M. [1] ; Cruz-Garcia, A. [2] ; Vazquez-Robaina, O. [3] ; Jardim, R. F. [4] ; Mune, P. [2]
Total Authors: 5
[1] Univ Camaguey, Dept Fis, Ctra Circunvalac Norte, Km 5 1-2, Camaguey - Cuba
[2] Univ Oriente, Dept Fis, Patricio Lumumba S-N, POB 90500, Santiago De Cuba - Cuba
[3] Univ Havana, Fac Phys, IMRE, LIEES Dept, Havana 10400 - Cuba
[4] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Web of Science Citations: 7

We have compared the dependence of the critical current density on maximum applied magnetic field, J(c)(0, H-am), performed in pellets with the derivative of magnetization versus applied magnetic field, dM(H-a)/dH(a), of the corresponding powder samples of Bi1.65Pb0.35Sr2Ca2+xCu3+xOy samples; x = 0.2 and 0.5. In both cases the measurements were performed at 77 K. We have focused in the applied magnetic field range in which the magnetization as a function of applied magnetic field, M(H-a), is quasi-linear. The comparison reveals that the penetration of the magnetic flux within powder particles is closely related to the trapped flux observed by means of the J(c)(0, H-am) dependence in pellet samples. The combined results are well explained within the framework of the three-level superconducting model. The results also suggest that the magnetic flux, for applied magnetic fields H-a ranged from similar to 30 to similar to 80 Oe, first penetrates the intragranular planar defects, as stacking faults and/or colonies of low angle boundaries, while the magnetic flux penetration in regions free of defects is observed for higher values of H-a. As a correlative result, we have observed a decrease of the superconducting critical temperature of the crystallites T-C with increasing x, which may be related with an increase of the number of stacking faults of the material. (C) 2016 Elsevier B. V. All rights reserved. (AU)

FAPESP's process: 14/19245-6 - Search for novel superconducting materials
Grantee:Renato de Figueiredo Jardim
Support type: Scholarships abroad - Research
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC