Flux-Line-Lattice Melting and Upper Critical Field of Bi1.65Pb0.35Sr2Ca2Cu3O10+delta Ceramic Samples

Autor(es)

Govea-Alcaide, E. ^[1] ; Mune, P. ^[1] ; Jardim, R. F. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Oriente, Dept Fis, Santiago De Cuba - Cuba

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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Superconductivity and Novel Magnetism; v. 25, n. 4, p. 779-784, MAY 2012.
• Citações Web of Science: 2

Resumo

We have conducted magnetoresistance measurements rho(T,H) in applied magnetic fields up to 18 T in Bi1.65Pb0.35Sr2Ca2Cu3O10+delta ceramic samples which were subjected to different uniaxial compacting pressures. The anisotropic upper critical fields H (c2)(T) were extracted from the rho(T,H) data, yielding and the out-of-plane superconducting coherence length xi (c) (0)similar to 3 . We have also estimated and xi (ab) (0) similar to 90 . In addition to this, a flux-line-lattice (FLL) melting temperature T (m) has been identified as a second peak in the derivative of the magnetoresistance d rho/dT data close to the superconducting transition temperature. An H (m) vs. T phase diagram was constructed and the FLL boundary lines were found to obey a temperature dependence H (m) ae(T (c) /T-1) (alpha) , where alpha similar to 2 for the sample subjected to the higher compacting pressure. A reasonable value of the Lindemann parameter c (L) similar to 0.29 has been found for all samples studied. (AU)

• Processo FAPESP: 10/52545-2 - Ernesto Govea Alcaide | Universidad de Oriente - Cuba
• Beneficiário: Renato de Figueiredo Jardim
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional