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Microstructure and superconducting properties of MgB2 films prepared by solid state reaction of multilayer precursors of the elements

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Soltan,  S.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Albrecht,  J.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kugler, B., Stahl, C., Treiber, S., Soltan, S., Haug, S., Schütz, G., et al. (2012). Microstructure and superconducting properties of MgB2 films prepared by solid state reaction of multilayer precursors of the elements. Thin Solid Films, 520(23), 6985-6988.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C35B-0
Abstract
Surface morphology and superconducting properties of MgB2 superconducting thin films prepared by ex-situ annealing of multilayer Mg/B precursors in Mg vapor are studied. Depending on the precursor structure different physical and microstructural properties of the superconductor evolve. Structure and composition of the films are analyzed by scanning electron microscopy and wavelength dispersive x-ray spectroscopy. It is found that certain precursor structures can lead to high quality superconducting films, however, in specific precursor structures mechanical stress leads to the formation of wrinkles strongly affecting the superconducting homogeneity of the films. A correlation between microstructure and superconducting properties, such as pinning or critical current density, can be provided via magneto-optical Faraday microscopy. (C) 2012 Elsevier B. V. All rights reserved.