Crossover from negative to positive magnetoresistance in superconductor/ferromagnet composites thick films |
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| Authors: | O. Paredes,E. Baca,D. Fuchs,O. Morá n |
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| Affiliation: | 1. Centro de Materiales, Facultad de Ingeniería, Universidad de Nariño, Ciudad Universitaria Torobajo, Pasto, Colombia;2. Grupo de Ingeniería de Nuevos Materiales, Departamento de Física, Universidad del Valle, A.A. 25360 Cali, Colombia;3. Karlsruhe Institute of Technology, Institut für Festkörperphysik, P.O. Box 3640, Karlsruhe,Germany;4. Laboratorio de Materiales Cerámicos y Vítreos, Departamento de Física, Universidad Nacional de Colombia, Sede Medellín, A.A. 568 Medellín, Colombia |
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| Abstract: | ![]()
Thick films of ((Bi, Pb)2Sr2Ca2Cu3Ox)0.95/(LaSr0.7Mn0.3O3)0.05 [(Bi-2223)0.95(LSMO)0.05] composites were fabricated on (0 0 1)-oriented LaAlO3 substrates by a simple melting–quenching–annealing method and their structural, morphological and magnetoelectrical properties carefully studied. Analysis of the X-ray diffraction patterns suggested a highly oriented growth along the c-axis of LSMO. This preferred orientation, with the crystal c-axis being perpendicular to the plane of the substrate, was considered to be indicative of a textured growth mode. Electrical and magnetic measurements showed the presence of ferromagnetism and superconductivity in the composite at temperatures above room temperature and below T∼50 K, respectively. A clear crossover from negative to positive magnetoresistance was observed at ∼80 K in a magnetic field as strong as 5 T. |
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| Keywords: | Thick films Superconductivity Ferromagnetism Composites |
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