Giant vibrations of impurity atoms on a crystal surface | Zendy

Robert E. Martinez | Zendy; Ernest Fontes | Zendy; J. A. Golovchenko | Zendy; J. R. Patel | Zendy

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Giant vibrations of impurity atoms on a crystal surface

Author(s) -

Robert E. Martinez,

Ernest Fontes,

J. A. Golovchenko,

J. R. Patel

Publication year - 1992

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.69.1061

Subject(s) - amplitude , debye model , condensed matter physics , crystal (programming language) , impurity , anisotropy , materials science , softening , surface (topology) , thermal , vibration , atomic physics , physics , molecular physics , thermodynamics , optics , quantum mechanics , geometry , mathematics , computer science , composite material , programming language

We have measured extremely large anisotropic thermal vibrations of gallium adatoms on a Si(111) surface using x-ray standing waves. At 830 K the rms amplitude normal to the surface is 0.47{plus minus}0.02 A while the parallel amplitude is 0.30{plus minus}0.02 A. The temperature dependence of these amplitudes deviates significantly from that expected from Debye theory and suggests a significant thermal softening of the surface bonding at elevated temperatures.

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