| Autor: |
Joost W. M. Frenken, H.M. van Pinxteren |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Surface Science. 275:383-394 |
| ISSN: |
0039-6028 |
| DOI: |
10.1016/0039-6028(92)90810-s |
| Popis: |
Medium energy ion scattering experiments on a cylindrically shaped Pb crystal demonstrate that at temperatures above 500 K, a finite amount of disorder develops at the Pb(001) surface and at vicinal surfaces with 5° and 10° miscut angle. The number of disordered atoms on these surfaces saturates between 1 and 0.05 K below the bulk melting point. The maximum amount of disorder increases with miscut angle from 1.3 ML on Pb(001) to 1.9 and 3.5 ML on the 5° and 10° vicinal surfaces, respectively. The observed scattered ion yields cannot be ascribed to mere anomalously strong surface vibrations. We conclude that these surfaces develop liquid-like disorder which can be interpreted as incomplete melting due to layering effects. The measurements show no sign of a prewetting transition up to (Tm − 0.05 K). Furthermore, we have no indication of a surface-melting induced faceting transition of the two vicinal surfaces. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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