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Thin Film Superconducting MgB2 Grown by MBE without Post-Anneal

Published online by Cambridge University Press:  18 March 2011

William Jo ,
Jeong-Uk Huh ,
Tsuyoshi Ohnishi ,
Ann F. Marshall ,
Malcolm R. Beasley  and
Robert H. Hammond
William Jo
Affiliation:
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045
Jeong-Uk Huh
Affiliation:
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045
Tsuyoshi Ohnishi
Affiliation:
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045
Ann F. Marshall
Affiliation:
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045
Malcolm R. Beasley
Affiliation:
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045
Robert H. Hammond
Affiliation:
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045
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Abstract

We report the synthesis of superconducting MgB2 thin films grown in-situ by molecular beam epitaxy (MBE). Mg-rich fluxes are deposited with B-flux by electron beam evaporation onto c- and r-plane sapphire substrates. Deposition temperature is varied between 260 ∼ 320 °C. Base pressure of the MBE chamber is at low 10-10 Torr, rising to 10-8 Torr during deposition due mostly to the presence of hydrogen and nitrogen. Asgrown MgB2 films show superconducting transition at ∼ 34 K with ΔTc < 1 K. The films on c-plane sapphire substrates exhibit c-axis oriented peaks of MgB2, and full-width at half maximum of 3 degree in their rocking curves. Azimuthal phi-scan of the MgB2(101) peak shows 12-fold symmetric peaks, which is confirmed by selected area diffraction pattern in transmission electron microscopy (TEM). Plan-view TEM shows hexagonal-shaped grain growth with grain size of about 400 Å.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 689: Symposium E – Materials for High-Temperature Superconductor Technologies , 2001 , E10.8
Copyright
Copyright © Materials Research Society 2002

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References

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