Experimental and theoretical study of transport properties in uniaxially pressed (Bi, Pb)(2)Sr2Ca2Cu3O10+delta ceramic samples

Autor(es)

Garcia-Fornaris, I. ^[1] ; Mune, P. ^[2] ; Suzuki, P. A. ^[3] ; Alberteris-Campos, M. ^[4] ; Jardim, R. F. ^[5] ; Govea-Alcaide, E. ^{[2, 4]}

Afiliação do(s) autor(es)

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

^[2] Univ Oriente, Dept Fis, Santiago De Cuba - Cuba

^[3] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil

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

^[5] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS; v. 470, n. 4, p. 269-276, FEB 15 2010.
• Citações Web of Science: 3

Resumo

Experimental and theoretical studies on the magnetic field dependence of the electrical resistance R(B(a)) and the transport noise (TN) in polycrystalline high-T(c) superconductors subjected to different uniaxial compacting pressures were conducted. X-ray diffraction rocking curves were performed in different surfaces of the samples in order to investigated the degree of texture The results indicated an improvement of the degree of texture with increasing the uniaxial compacting pressure In theoretical simulations of the data, the polycrystalline superconductors were described as a series-parallel array of Josephson devices The intergranular magnetic field is described within the framework of the intragranular flux-trapping model and the distribution of the grain-boundary angles is assumed to follow the Rayleigh statistical function The proposed model describes well the experimental magnetoresistance R(B(a)) data We have found that the behavior of the R(B(a)) curves changes appreciably when different uniaxially compacting pressures are applied to the sample and such a changes are reproduced by the model when different grain-boundary angles distributions are used In addition, changes in the R(B(a)) dependence have their counterparts in the experimental transport noise signals (C) 2009 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: 08/52955-6 - Ernesto Govea Alcaide | Universidad de Oriente - Cuba
• Beneficiário: Renato de Figueiredo Jardim
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional