Preparation and characterization of melt textured NdBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ </sub> bulk superconducting ceramics
Tancret, F.; Monot, I.; Laffez, P.; Van Tendeloo, G.; Desgardin, G.; Tancret F.; Laboratoire CRISMAT, ISMRA, UMR 6508 ; Laboratoire LERMAT, UPRESSA 6004, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France; Monot I.; Laboratoire CRISMAT, ISMRA, UMR 6508; Laffez P.; EMAT-RUCA, University of Antwerp, 171 Groenenborgerlaan, 2020 Antwerp, Belgium ; Laboratoire de physique de l'état condensé, Université du Maine, route de Laval, 72017 Le Mans, France; Van Tendeloo G.; EMAT-RUCA, University of Antwerp, 171 Groenenborgerlaan, 2020 Antwerp, Belgium; Desgardin G.; Laboratoire CRISMAT, ISMRA, UMR 6508
Журнал:
The European Physical Journal Applied Physics
Дата:
1998
Аннотация:
NdBaCuO superconductors have been textured by the oxygen controlled melt growth method. The addition of platinum or Nd422 does not refine the 422 phase, but the latter improves the microstructural quality. High purity precursors are necessary to achieve high T <sub>c</sub> and J <sub>c</sub> (up to 56 000 A/cm<sup>2</sup>). The flux pinning mechanisms are discussed in terms of oxygen deficiency, Nd-Ba substitution and softening of the vortex lattice.
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