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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.)

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

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Author(s):
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]
Total Authors: 7
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 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
Total Affiliations: 6
Document type: Journal article
Source: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 29, n. 7, p. 5926-5933, APR 2018.
Web of Science Citations: 0
Abstract

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)

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
FAPESP's process: 14/19245-6 - Search for novel superconducting materials
Grantee:Renato de Figueiredo Jardim
Support type: Scholarships abroad - Research