Superconducting MgB(2) films via precursor post-processing approach

Details Superconducting MgB(2) films via precursor post-processing approach Superconducting MgB(2) films via precursor post-processing approach

2001-03-27

arxiv.org/abs/cond-mat/0103569v1

Physics

Condensed Matter

Superconductivity

PDF file with 10 pages total, including 4 figures

Scientific paper

10.1063/1.1377323

Superconducting MgB(2) films with Tc = 38.6 K were prepared using a precursor-deposition, ex-situ post-processing approach. Precursor films of boron, ~0.5 micrometer thick, were deposited onto Al(2)O(3) (102) substrates by e-beam evaporation; a post-anneal at 890 deg C in the presence of bulk MgB(2) and Mg metal produced highly crystalline MgB(2) films. X-ray diffraction indicated that the films exhibit some degree of c-axis alignment, but are randomly oriented in-plane. Transport current measurements of the superconducting properties show high values of the critical current density and yield an irreversibility line that exceeds that determined by magnetic measurements on bulk polycrystalline materials.

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