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

MRS Online Proceedings Library volume 291, pages205–210(1992)Cite this article

Abstract

We have explored the structure and the dynamics of a bimetallic system consisting of a hexagonal (almost) overlayer of Ag on 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.

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Affiliations

  1. Dept. of Physics, Brookhaven National Laboratory, Bldg. 510A, Upton, NY, 11973, USA

    Talat S. Rahman

  2. Dept. of Physics, Brock University, St. Catherines, Ontario, L2S 3A1, Canada

    John E. Black & Zeng Ju Tian

  3. Dept. of Physics, Kansas State University, Manhattan, KS, 66506, USA

    Talat S. Rahman

Authors
  1. Talat S. Rahman
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  2. John E. Black
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  3. Zeng Ju Tian
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Correspondence to Talat S. Rahman.

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Rahman, T.S., Black, J.E. & Tian, Z.J. Dynamics of a Metal Overlayer on Metallic Substrates–High Temperature Effects. MRS Online Proceedings Library 291, 205–210 (1992). https://doi.org/10.1557/PROC-291-205

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