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

Journal Article · Mon Mar 13 04:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.2054· OSTI ID:6767430

Meli, C A; Greene, E F ^[1]; Lange, G; Toennies, J P ^[2]

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1. Department of Chemistry, Brown University, Providence, Rhode Island 02912 (United States)
2. Max-Planck-Institut fuer Stroemungsforschung, Bunsenstrasse 10, 37073 Goettingen (Germany)

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.

• DOE Contract Number: FG02-85ER13441
• OSTI ID: 6767430
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 74:11; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMIC BEAMS
BEAMS
CRYSTAL-PHASE TRANSFORMATIONS
ELEMENTS
GERMANIUM
METALS
MORPHOLOGY
PHASE TRANSFORMATIONS
SCATTERING
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K