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Journal Article

Synthesis of MgB2 films in Mg vapour flow and their characterization

MPS-Authors
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Matveev,  A. T.
Scientific Facility Thin Film Technology (Gennady Logvenov), 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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Konuma,  M.
Scientific Facility Interface Analysis (Ulrich Starke), Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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

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Krockenberger,  Y.
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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Starke,  U.
Scientific Facility Interface Analysis (Ulrich Starke), Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier,  H.-U.
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;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Matveev, A. T., Albrecht, J., Konuma, M., Cristiani, G., Krockenberger, Y., Starke, U., et al. (2006). Synthesis of MgB2 films in Mg vapour flow and their characterization. Superconductor Science and Technology, 19(4), 299-305.


Cite as: https://hdl.handle.net/21.11116/0000-000F-027D-3
Abstract
Surface morphology, element distribution and superconducting properties
of MgB2 filins prepared by ex situ annealing of multilayer B/Mg
precursors in a flow of Mg vapour have been studied. The composition of
the films and distribution of the elements have been analysed by both
Auger electron spectroscopy (AES) and x-ray photoelectron spectroscopy
(XPS). The films were found to be composed of a metallic Mg and an
Mg-deficient Mg1-xB2 phase. Al and O have also been detected across the
whole film, suggesting a reaction of the substrate with the adjacent Mg
layer of the precursor. The films are nano-crystal line or even
amorphous, which is ascribed to precipitation of impurities at grain
boundaries. The critical current density of the MgB2 films extracted
from both magneto-optical and magnetization measurements is J(c)
similar to 1 X 10(7) A cm(-2) at 10 K and self-field, and J(c) similar
to 3 x 10(4) A cm(-2) at 2 T and 5 K. The upper critical field is H-c2
= 6.5 T at 5 K. Additionally, an unknown phase is found in the
Mg-Al-2-O-3 System after annealing of Mg films on sapphire in
conditions similar to the synthesis process.