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Direct identification of extended defects as vortex pinning centers in melt textured YBa2Cu3O7-Y2BaCuO5 composites
Puig, T.; Obradors i Berenguer, Francesc Xavier; Martínez, B.; Sandiumenge, F.; O'Callaghan Castellà, Juan Manuel; Rabier, J.
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones
Single domain YBa2Cu3O7-Y2BaCuO5 melt textured ceramic composites have revealed a very rich microstructure, which has usually impeded, by using standard measurements, to evaluate the contribution of each defect to the enhancement of the critical current. We have measured the inplane magnetoresistance anisotropy and the anisotropic in-plane inductive critical currents and we show that together with the microstructural TEM analysis, the contribution of the different extended pinning centers can be separated. These results have allowed us to infer the kind of microstructure modifications required to improve the critical current. In particular, we present an isostatic pressing deformation technique as a very promising post-processing treatment to strongly increase the critical currents of these composites.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica::Components electrònics
Oxide superconductors
Stacking faults
Ceramic matrix composites
Crystal microstructure
Critical current density (superconductivity)
Magnetic anisotropy
Transmission electron microscopy
Grain boundaries
Magnetic variables measurement
Magnetic fields
Vortex pinning
Melt textured ceramic composites
Magnetoresistance measurement
Superconductors ceràmics

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