THE TEMPERATURE DEPENDENCE OF THE SURFACE RELAXATION OFCu(111) ANDAg(111)— EVIDENCE FOR GIANT ANHARMONIC EFFECTS

K. H. Chae, H. C. Lu, P. Statiris and T. Gustafsson
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K. H. Chae: Department of Physics and Astronomy & Laboratory for Surface Modification, PO Box 849, Rutgers — The State University of New Jersey, Piscataway, NJ 08855-0849, USA
H. C. Lu: Department of Physics and Astronomy & Laboratory for Surface Modification, PO Box 849, Rutgers — The State University of New Jersey, Piscataway, NJ 08855-0849, USA
P. Statiris: Department of Physics and Astronomy & Laboratory for Surface Modification, PO Box 849, Rutgers — The State University of New Jersey, Piscataway, NJ 08855-0849, USA
T. Gustafsson: Department of Physics and Astronomy & Laboratory for Surface Modification, PO Box 849, Rutgers — The State University of New Jersey, Piscataway, NJ 08855-0849, USA

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1091-1094

Abstract: We have used medium energy ion scattering with channeling and blocking to measure the spacing between the two outermost atomic layers on the (111) faces of Cu and Ag as a function of temperature. TheAg(111)surface undergoes a dramatic transformation from being slightly contracted at room temperature to being strongly expanded(+10%of the bulk spacing) around 900°C.Cu(111)shows similar but smaller effects. The change of the surface lattice constant is paralleled by large enhancements of the surface vibration amplitudes. We therefore conclude that our observations are due to large anharmonic effects at the surface. We further discuss our results in terms of a recent microscopic theoretical analysis.

Date: 1997
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DOI: 10.1142/S0218625X97001358

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