Influence of the spark-plasma texturing conditions on the intragranular features of Bi-2223 ceramic samples

Autor(es)

Perez-Acosta, L. ^[1] ; Govea-Alcaide, E. ^{[2, 3]} ; Rosales-Saiz, F. ^[3] ; Noudem, J. G. ^[4] ; Machado, I. F. ^[5] ; Jardim, R. F. ^[6]

Afiliação do(s) autor(es)

^[1] Univ Camaguey, Fac Informat & Ciencias Exactas, Dept Fis, Camaguey - Cuba

^[2] Univ Fed Amazonas, Dept Fis, Manaus, Amazonas - Brazil

^[3] Univ Granma, Fac Ciencias Informat Nat & Exactas, Dept Matemat Fis, Bayamo - Cuba

^[4] Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, F-14000 Caen - France

^[5] Univ Sao Paulo, Escola Politecn, Dept Engn Mecatron & Sistemas Mecan, Sao Paulo, SP - Brazil

^[6] Univ Sao Paulo, Inst Fis, Dept Fis & Mat Mecan, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 30, n. 7, p. 6984-6992, APR 2019.
• Citações Web of Science: 0

Resumo

The influence of the spark-plasma texturing (SPT) conditions on the intragranular superconducting properties of Bi1.65Pb0.35Sr2Ca2Cu3O10+ (Bi-2223) samples has been investigated. Also, the SPT samples were subjected to a post-annealing heat treatments (PAHT) in different times. Intragranular superconducting features, extracted from magnetoresistance measurements, (T,H), in applied magnetic fields up to 9 T, were studied by analyzing the temperature dependence of the in-plane upper critical field, Hc2ab(T), and the magnetic field dependence of the pinning energy at zero temperature, U(0,H). The results indicated that, before and after the PAHT, values of the Hc2ab(0), obtained by using the Werthamer-Helfand-Hohenberg formula, increased approximate to 21%, i.e., from 115.8 to 140.2 T. We have also found that the effective intragranular pinning energy at zero applied magnetic field, U0=U(0,0), also increased over approximately three times, from 0.28 to 0.98 eV. These results strong strongly indicate that the SPT process is responsible for inducing deoxygenation at the intragranular level of ceramic samples, a feature presumably occurring near of the end of planar defects. (AU)

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