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Superconducting Properties in Amorphous MgxB1−x Films

Superconducting Properties in Amorphous MgxB1−x Films We report the observation of superconductivity in a thick amorphous (a-) MgxB1−x film with x∼0.3, which was prepared by coevaporation of Mg and B. The resistivity in the normal state is by approximately two order of magnitude higher than that for clean MgB2 crystals. The transition temperature T c at which the resistivity vanishes is found to be 6 K, that is even lower than T c=39 K for clean MgB2 crystals. The upper critical field extrapolated to zero temperature is about 5 T. Based on the data of resistivity measured down to 0.4 K for various fields B, we construct the possible B−T phase diagram over the broad temperature/field region. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Superconducting Properties in Amorphous MgxB1−x Films

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Publisher
Springer Journals
Copyright
Copyright © 2003 by Plenum Publishing Corporation
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1023/A:1023409412004
Publisher site
See Article on Publisher Site

Abstract

We report the observation of superconductivity in a thick amorphous (a-) MgxB1−x film with x∼0.3, which was prepared by coevaporation of Mg and B. The resistivity in the normal state is by approximately two order of magnitude higher than that for clean MgB2 crystals. The transition temperature T c at which the resistivity vanishes is found to be 6 K, that is even lower than T c=39 K for clean MgB2 crystals. The upper critical field extrapolated to zero temperature is about 5 T. Based on the data of resistivity measured down to 0.4 K for various fields B, we construct the possible B−T phase diagram over the broad temperature/field region.

Journal

Journal of Low Temperature Physics – Springer Journals

Published: Oct 7, 2004

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