Abstract
Polycrystalline thick films with the nominal composition [(Bi,Pb)2Sr2Ca2Cu3O x ]1−x (La0.7Sr0.3MnO3) x (x=0, 0.01, 0.03, 0.05) were prepared by the melting-quenching-annealing (MQA) method on (001)-oriented LaAlO3 (LAO) substrates. The XRD patterns show that the samples are composites consisting of (Bi,Pb)2Sr2Ca2Cu3O x and La0.7Sr0.3MnO3 particles with average grain sizes of ∼60 and ∼30 nm, respectively. From electric transport measurements, the superconducting onset temperature, T onset, and superconducting critical temperature, T c, ended up being ∼80 and ∼60 K, respectively. The depression of T c may be attributed to the proximity effect between ferromagnetism and superconductivity. The M–H hysteresis loops indicate the coexistence of ferromagnetism and superconductivity in the films. The magnetic field dependence of the superconducting current density and the volume pinning force F p=J c×B were obtained by applying Bean’s model to the isothermal M–H loops.
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Acknowledgements
The authors wish to thank the financial support of the Universidad del Valle (Contract 774), and the Universidad de Nariño. O. Morán acknowledges the support of the German Academic Exchange Service (DAAD) through the program “Wiedereinladung.”
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Paredes, O., Baca, E. & Morán, O. Superconducting and Magnetic Properties of Polycrystalline [(Bi,Pb)2Sr2Ca2Cu3O x ]1−x (La0.7Sr0.3MnO3) x Thick Films Grown Using MQA Method. J Supercond Nov Magn 26, 303–309 (2013). https://doi.org/10.1007/s10948-012-1745-4
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DOI: https://doi.org/10.1007/s10948-012-1745-4