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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.)

Voltage relaxation and Abrikosov-Josephson vortices in Bi-2223 superconductors doped with alpha-Al2O3 nanoparticles

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Autor(es):
Hernandez-Wolpez, M. [1] ; Fernandez-Gamboa, J. R. [2] ; Garcia-Fornaris, I. [3] ; Govea-Alcaide, E. [4] ; Perez-Tijerina, E. [5] ; Jardim, R. F. [6] ; Mune, P. [2]
Número total de Autores: 7
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 Granma, Dept Ciencias Basicas, Apdo 21, POB 85100, Bayamo - Cuba
[4] Univ Fed Amazonas, Dept Fis, Ave Gen Rodrigo Octavio, 6200 Coroado I, BR-69077000 Manaus, Amazonas - Brazil
[5] UANL, FCFM, Ctr Invest Ciencias Fis Matemat, Monterrey, Nuevo Leon - Mexico
[6] Univ Sao Paulo, Inst Fis, CP 66318, BR-05315970 Sao Paulo, SP - Brazil
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 29, n. 7, p. 5926-5933, APR 2018.
Citações Web of Science: 0
Resumo

We have observed a change in the behaviour of voltage-relaxation curves with remnant magnetic flux, when the maximum magnetic field applied before starting the relaxation process, , reaches 80 Oe in two samples of (Bi-2223) doped with - nanoparticles. This modification consists in the emergence of a maximum in the temporal dependence of the voltage, V(t), which appears in the vicinity of the first 5 s after applying to the sample an excitation current lightly higher than the superconducting critical current of the material. In addition to that, the voltage drop rate increases appreciably with increasing applied magnetic fields. As complementary studies, X-ray diffraction patterns, scanning electron microscopy, measurements of magnetization as a function of applied magnetic field and critical current density are also included. The experimental results corroborate the occurrence of intragranular Abrikosov-Josephson vortices in Bi-2223 ceramic superconductors. Furthermore, the analysis provides a new procedure for detecting penetration of the magnetic flux into intragranular planar defects and clean regions of the grains (crystallites), with increasing applied maximum magnetic field, . (AU)

Processo FAPESP: 14/19245-6 - Procura por novos materiais supercondutores
Beneficiário:Renato de Figueiredo Jardim
Linha de fomento: Bolsas no Exterior - Pesquisa
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