Transport Barkhausen-like noise in uniaxially pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+delta ceramic samples

Autor(es)

Garcia-Fornaris, I. ^[1] ; Govea-Alcaide, E. ^{[2, 3]} ; Alberteris-Campos, M. ^[4] ; Mune, P. ^[3] ; Jardim, R. F. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Granma, Dept Ciencias Basicas, Bayamo - Cuba

^[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

^[3] Univ Oriente, Dept Fis, Santiago De Cuba - Cuba

^[4] Univ Sao Paulo, Dept Engn Mecan, Escola Politecn, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS; v. 470, n. 15-16, p. 611-616, AUG 1 2010.
• Citações Web of Science: 3

Resumo

We report on the detection of the transport Barkhausen-like noise (TBN) in polycrystalline samples of Bi(1.65)Pb(0.35)Sr(2)Ca(2) Cu(3)O(10+delta) (Bi-2223) which were subjected to different uniaxial compacting pressures. The transport Barkhausen-like noise was measured when the sample was subjected to an ac triangular-shape magnetic field (f similar to 1 Hz) with maximum amplitude B(max) approximate to 5.5 mT, in order to avoid the flux penetration within the superconducting grains. Analysis of the TBN signal, measured for several values of excitation current density, indicated that the applied magnetic field in which the noise signal first appears, B(a)(t(i)), is closely related to the magnetic-flux pinning capability of the material. The combined results are consistent with the existence of three different superconducting levels within the samples: (i) the superconducting grains; (ii) the superconducting clusters; and (iii) the weak-links. We finally argue that TBN measurements constitute a powerful tool for probing features of the intergranular transport properties in polycrystalline samples of high-T(c) superconductors. (C) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 05/53241-9 - Estudo de fenômenos intergranulares em materiais cerâmicos
• Beneficiário: Reginaldo Muccillo
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/51562-3 - Ernesto Govea Alcaide | Universidad de Oriente - Cuba
• Beneficiário: Renato de Figueiredo Jardim
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional