Unusual disordering processes of oxygen overlayers on Rh(110): a combined HAS and LEED study
| Autor: | H. OVER, S. SCHWEGMANN, D. CVETKO, V. DE RENZI, L. FLOREANO, R. GOTTER, MORGANTE, ALBERTO, M. PELOI, S. ZENNARO, TOMMASINI, FERNANDO |
|---|---|
| Přispěvatelé: | H., Over, S., Schwegmann, D., Cvetko, V., DE RENZI, L., Floreano, R., Gotter, Morgante, Alberto, M., Peloi, Tommasini, Fernando, S., Zennaro |
| Rok vydání: | 1997 |
| Zdroj: | Physical review. B, Condensed matter 55 (1997): 4717–4722. doi:10.1103/PhysRevB.55.4717 info:cnr-pdr/source/autori:H. Over, S. Schwegmann, D. Cvetko, V. De Renzi, L. Floreano, R. Gotter, A. Morgante, M. Peloi, and F. Tommasini, S. Zennaro/titolo:Unusual disordering processes of oxygen overlayers on Rh(110): a combined HAS and LEED study/doi:10.1103%2FPhysRevB.55.4717/rivista:Physical review. B, Condensed matter/anno:1997/pagina_da:4717/pagina_a:4722/intervallo_pagine:4717–4722/volume:55 |
| Popis: | The temperature-dependent behavior of the Rh(111)-(2X2)-10 phase was investigated by He-atom scattering (HAS) and low-energy electron diffraction. The adsorption system undergoes an order-disorder phase transition at T-c=280+/-5 K, with critical exponents found to be consistent with the four-state Potts model. Beyond the phase transition the HAS specular peak intensity exhibits a strong and reversible increase. This finding points toward a reduction of the surface charge-density corrugation induced by the phase transition itself. Around 160 K, hydrogen adsorbed on the Rh(111)-(2X2)-10 surface reacts with oxygen to form water, and drives the overlayer in an out-of-equilibrium condition which is characterized by a dramatic domain-wall proliferation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|