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Dynamics of a Metal Overlayer on Metallic Substrates – High Temperature Effects

Published online by Cambridge University Press:  01 January 1992

Talat S. Rahman ,
John E. Black  and
Zeng Ju Tian
Talat S. Rahman
Affiliation:
Brookhaven National Laboratory, Dept. of Physics, Bldg. 510A, Upton, NY 11973 Permanent Address: Kansas State University, Dept. of Physics, Manhattan, KS 66506
John E. Black
Affiliation:
Brock University, Dept. of Physics, St. Catherines, Ontario L2S 3A1, Canada
Zeng Ju Tian
Affiliation:
Brock University, Dept. of Physics, St. Catherines, Ontario L2S 3A1, Canada
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Abstract

We have explored the structure and the dynamics of a bimetallic system consisting of a hexagonal (almost) overlayer of Agon a square lattice (Ni(100) and Cu(100)), as a function of the surface temperature. In each case the structure is "nearly" incommensurate giving rise to a low frequency Goldstone mode. Also, the overlayer atoms slosh back and forth over the substrate in a corrugated fashion. The calculated dispersion of the Ag/metal vertical mode, at room temperature, is in excellent agreement with experimental data. At higher temperatures floater atoms appear on top of the overlayer displaying a variety of cluster formations and also exchanges with the substrate atoms leading to surface disordering, interdiffusion and melting.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 291: Symposium O – Materials Theory and Modeling , 1992 , 205
Copyright
Copyright © Materials Research Society 1993

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References

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