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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Hernandez-Wolpez, M. [1] ; Cruz-Garcia, A. [2] ; Vazquez-Robaina, O. [3] ; Jardim, R. F. [4] ; Mune, P. [2]
Número total de Autores: 5
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS; v. 525, p. 84-88, JUN 2016.
Citações Web of Science: 5
Resumo

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)

Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
Beneficiário:Elson Longo da Silva
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 14/19245-6 - Procura por novos materiais supercondutores
Beneficiário:Renato de Figueiredo Jardim
Linha de fomento: Bolsas no Exterior - Pesquisa