| Full text | |
| Author(s): |
Hernandez-Wolpez, M.
[1]
;
Cruz-Garcia, A.
[2]
;
Vazquez-Robaina, O.
[3]
;
Jardim, R. F.
[4]
;
Mune, P.
[2]
Total Authors: 5
|
| Affiliation: | [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 |
| Source: | PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS; v. 525, p. 84-88, JUN 2016. |
| Web of Science Citations: | 6 |
| Abstract | |
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 Opportunities: | Scholarships abroad - Research |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |