LEEM Investigation of Refractory Metals Grown on Insulating Substrates: Nb(110) on Sapphire$(11\bar{2}0)$

W. Świȩch, R. S. Appleton, B. D. Wiemeyer and C. P. Flynn
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W. Świȩch: Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA
R. S. Appleton: Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA
B. D. Wiemeyer: Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA
C. P. Flynn: Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA

Surface Review and Letters (SRL), 1998, vol. 05, issue 06, 1221-1231

Abstract: We summarize LEEM studies of Nb (110) single crystals grown by MBE onAl2O3$(11\bar{2}0)$. At temperatures between 1300 K and 1600 K the structure relaxes to create flat terraces several μm wide, and stable subgrain boundaries, by clearly visible interfacial and surface processes. The Nb surface exhibits two mirror-equivalent variants of a reconstruction, one of which prevails at low temperatures. Upon approachingTcat~1480K, the two variants alternate in extended stripes along$[1\bar{1}0]$, with stripe widths that decrease smoothly asTapproachesTc. Both at lowTand aboveTc, variants are trapped at dislocation strain fields.

Date: 1998
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DOI: 10.1142/S0218625X98001559

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