NDLI: In-situ annealing effects on MgB/sub 2/ thin films fabricated by electron beam deposition

Content Provider	IEEE Xplore Digital Library
Author	Mori, Z. Doi, T. Ishizaki, Y. Nagatomo, K. Hamada, S. Hakuraku, Y. Okada, M. Saitoh, K. Kitaguchi, H.
Copyright Year	2002
Abstract	Although the as-grown method is becoming the main current for fabrication of MgB/sub 2/ thin films, the in-situ annealing method is still indispensable and effective for obtaining thin films with a high zero resistivity temperature and current density. We have investigated the effects of in-situ annealing on the superconducting properties of MgB/sub 2/ thin films. MgB/sub 2/ thin films were fabricated by electron beam epitaxy on C-plane sapphire (Al/sub 2/O/sub 3/) substrate. Thin films were produced by simultaneously evaporating B and Mg metal in a high vacuum of 3/spl times/10/sup -7/ Pa. Substrate temperature was 265/spl deg/C. The zero resistivity temperature of the as-grown thin films was 31 K. Electron beam deposition was followed by in-situ annealing in a high vacuum. In the optimal annealing process (a thin film is heated at 600/spl deg/C for one hour) we have consistently obtained thin films with a zero resistivity temperature of 35 K. In contrast, the critical current density of MgB/sub 2/ thin films was decreased by annealing. This suggests that the crystal grain boundaries in the MgB/sub 2/ thin films are working as a flux pinning site, and crystal growth from annealing brought about the reduction of current density.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3245
Ending Page	3248
Page Count	4
File Size	357878
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Annealing Superconducting thin films Temperature Transistors Conductivity Grain boundaries Current density Electron beams Substrates Fabrication thin films Electron beam epitaxial growth superconductor
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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