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

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.

This is a preview of subscription content, access via your institution.

References

  1. 1.

    H. Ohtani, C.-T. Kao, M. A. van Hove, and G. A. Somorjai, Prog. Sur. Sci. 23, 155 (1986).

    Article  Google Scholar 

  2. 2.

    P. W. Palmberg and T. N. Rhodin, J. Chem. Phys. 49, 134 (1968).

    CAS  Article  Google Scholar 

  3. 3.

    W. Daum, J. Electron Spectrosc. Related Phenomena 44, 271 (1987); J. E. Black, D. L. Mills, W. Daum, C. Stuhlmann, and H. Ibach, Sur. Sci. 217, 529 (1989).

    CAS  Article  Google Scholar 

  4. 4.

    A. Brodde, G. Wilhelmi, D. Badt, H. Wengelnik, and H. Neddermeyer, J. Vac. Sci. Tech. B9, 920 (1991).

    Article  Google Scholar 

  5. 5.

    J. E. Black and D. L. Mills, Phys. Rev. B42, 5610 (1990).

    Article  Google Scholar 

  6. 6.

    J. E. Black, A. Janzen, and P. Bopp, Sur. Sci. 259, 371 (1992).

    Article  Google Scholar 

  7. 7.

    T. S. Rahman and J. E. Black, (to be published).

  8. 8.

    T. S. Rahman, J. E. Black, and Z. Tian, (to be published).

  9. 9.

    M. S. Daw and M. I. Baskes, Phys. Rev. B29, 6443 (1984); S. M. Foiles, M. I. Baskes, and M. S. Daw, Phys. Rev. B33, 7983 (1986).

    Article  Google Scholar 

  10. 10.

    L. Yang, T. S. Rahman, and J. E. Black, Sur. Sci. (to appear).

  11. 11.

    Z. Tian and T. S. Rahman, (to be published).

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Talat S. Rahman.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

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

Download citation