Evidence for an order-order transition on the Ge(111) surface near 1050 K from high-resolution helium atom scattering experiments

Helium atom scattering has been used to investigate the Ge(111) surface phase transition at [ital T][sub [ital c]]=1050 K. The [ital elastically] scattered helium atoms show sharp, integral-order diffraction peaks that change only in their relative amplitudes at [ital T][sub [ital c]] and persist up...

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Bibliographic Details
Published in:Physical review letters 1995-03, Vol.74:11
Main Authors: Meli, C.A., Greene, E.F., Lange, G., Toennies, J.P.
Format: Article
Language:English
Subjects:
665100 > Nuclear Techniques in Condensed Matter Physics > (1992-)
ATOMIC BEAMS
BEAMS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL-PHASE TRANSFORMATIONS
ELEMENTS
GERMANIUM
MATERIALS SCIENCE
METALS
MORPHOLOGY
PHASE TRANSFORMATIONS
SCATTERING
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 1000-4000 K
TEMPERATURE RANGE 360602 > Other Materials-- Structure & Phase Studies
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Summary:Helium atom scattering has been used to investigate the Ge(111) surface phase transition at [ital T][sub [ital c]]=1050 K. The [ital elastically] scattered helium atoms show sharp, integral-order diffraction peaks that change only in their relative amplitudes at [ital T][sub [ital c]] and persist up to 1160 K, the highest temperature studied. Contrary to previous reports based on low-energy electron and x-ray diffraction, ion backscattering, and a recent theoretical study, the present findings show that the surface remains highly ordered above [ital T][sub [ital c]], with a reduced height of the top bilayer, and that it may be metallic as was recently observed in electron energy loss spectroscopy.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.74.2054