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Deposition and Properties of Superconducting MgB2 Thin Films |
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| Authors: | X. X. Xi X. H. Zeng A. V. Pogrebnyakov A. Soukiassian S. Y. Xu Y. F. Hu E. Wertz Q. Li Y. Zhong C. O. Brubaker Z.-K. Liu E. M. Lysczek J. M. Redwing J. Lettieri D. G. Schlom W. Tian H. P. Sun X. Q. Pan |
| Affiliation: | 1. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, 16802 2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802 3. Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, Michigan, 48109 |
| Abstract: | The recently discovered superconductor MgB2 with T c at 39 K has great potential in superconducting electronics. In this paper, we review the deposition techniques used for MgB2 thin films in the light of a thermodynamic study of the Mg-B system with the calculation of phase diagrams (CALPHAD) modeling technique. This thermodynamic study identifies a growth window in the pressure–temperature phase diagram, in which the magnesium pressure is very high for likely in situ growth temperatures. A Hybrid Physical–Chemical Vapor Deposition (HPCVD) technique that successfully achieves such a high Mg pressure is shown to produce in situ epitaxial MgB2 thin films with bulk superconducting properties. |
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