Enhanced surface anharmonicity observed in vibrations on Cu(110)
- 27 May 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 66 (21), 2770-2773
- https://doi.org/10.1103/PhysRevLett.66.2770
Abstract
Surface anharmonicity has been measured on Cu(110) by examining the temperature dependence of surface phonons with atomic motion normal to the surface using high-resolution electron-energy-loss spectroscopy. At the Brillouin zone center Γ¯ the energy of the resonance decreases by 3.2 meV and the intrinsic width increased by 8.6 meV as the temperature increases from 21 to 766 K. Energy decrease and width increase are also observed at the Brillouin zone edge Y¯ in the phonon. The percentage energy decrease is the same in both phonons. Direct comparison with bulk-phonon measurements shows that the anharmonicity at the surface is 4.1–4.8 times greater than in the bulk.
Keywords
This publication has 19 references indexed in Scilit:
- No Thermal Roughening on Cu(110) up to 900 KPhysical Review Letters, 1989
- Thermal roughening of the copper (110) surface: An x-ray diffraction experimentPhysical Review Letters, 1987
- The Dynamics of Cu(100) Surface Atoms at High TemperatureEurophysics Letters, 1987
- Evidence for anomalous thermal expansion at a crystal surfacePhysical Review Letters, 1987
- A study of the high temperature stability of low index planes of copper by atomic beam diffractionSurface Science, 1985
- Surface melting of copperPhysical Review B, 1985
- Inelastic Low-Energy Atom-Surface ScatteringPhysical Review Letters, 1984
- Experimental and theoretical analysis of temperature effects in spin-polarized low energy electron diffraction from W(001)Surface Science, 1981
- Surface relaxation and thermal expansion for the (001) face of α-Fe and CuSurface Science, 1978
- Thermally Induced Breakdown of the Direct-Transition Model in CopperPhysical Review Letters, 1977