Enhancement of lower critical field by reducing the thickness of epitaxial and polycrystalline MgB 2 thin films

For potential applications in superconducting RF cavities, we have investigated the properties of polycrystalline MgB₂ films, including the thickness dependence of the lower critical field Hc₁. MgB₂ thin films were fabricated by hybrid physical-chemical vapor deposition on (0001) SiC substrate eithe...

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Bibliographic Details
Published in:APL materials 2015-04, Vol.3 (4)
Main Authors: Tan, Teng, Wolak, M. A., Acharya, Narendra, Krick, Alex, Lang, Andrew C., Sloppy, Jennifer, Taheri, Mitra L., Civale, L., Chen, Ke, Xi, X. X.
Format: Article
Language:English
Subjects:
MATERIALS SCIENCE
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Summary:For potential applications in superconducting RF cavities, we have investigated the properties of polycrystalline MgB₂ films, including the thickness dependence of the lower critical field Hc₁. MgB₂ thin films were fabricated by hybrid physical-chemical vapor deposition on (0001) SiC substrate either directly (for epitaxial films) or with a MgO buffer layer (for polycrystalline films). When the film thickness decreased from 300 nm to 100 nm, Hc₁ at 5 K increased from around 600 Oe to 1880 Oe in epitaxial films and to 1520 Oe in polycrystalline films. The result is promising for using MgB₂/MgO multilayers to enhance the vortex penetration field.
ISSN:2166-532X
2166-532X