Order–disorder transition for corrugated Au layers
| Autor: | Yaroslav B. Losovyj, S. Zuber, N. Lozova, Peter A. Dowben, P. V. Galiy, Keisuke Fukutani |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Phase transition
Range (particle radiation) Condensed matter physics Low-energy electron diffraction Chemistry General Physics and Astronomy Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Overlayer law.invention symbols.namesake Crystallography law Monolayer symbols Scanning tunneling microscope Single crystal Debye model |
| Zdroj: | Applied Surface Science. 256:4796-4800 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2010.01.106 |
| Popis: | Atomic-scale structure of the growth of a gold film on (1 1 2) plane of Mo single crystal was investigated by means of low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) up to two monolayers (ML) of gold coverage. Both LEED and STM results establish that Au grows on Mo(1 1 2) in a layer-by-layer mode, for at least the first two monolayers. A number of ordered structures are formed and both the first and second layers adopt the Mo(1 1 2) 1 × 1 surface structure upon completion. For some gold layers on Mo(1 1 2), notably the 1.66 monolayer 3 × 1 and 1.75 monolayer 4 × 1 gold overlayers, we find evidence of a phase transition associated with increasing disorder in gold layers with structural corrugation and anisotropic band structure. The signature of this phase transition, at temperatures in the range of 400–500 K, is a sharp decrease in the overlayer effective Debye temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect