Impurity-induced changes of overlayer symmetry and of phase transitions

We show in a Low Energy Electron Diffraction (LEED) experiment that small concentrations of oxygen atoms (2 to 12% of a monolayer) added to half a monolayer of Sr on Mo(112), ordered in a $c(2\times 2)$ structure, do not destroy order, but introduce new correlations with different translational symm...

Full description

Saved in:
Bibliographic Details
Published in:Europhysics letters 2001-10, Vol.56 (1), p.67-73
Main Authors: Godzik, G, Pfnür, H, Lyuksyutov, I. F
Format: Article
Language:English
Subjects:
68.35.Md
68.35.Rh
68.55.Ln
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We show in a Low Energy Electron Diffraction (LEED) experiment that small concentrations of oxygen atoms (2 to 12% of a monolayer) added to half a monolayer of Sr on Mo(112), ordered in a $c(2\times 2)$ structure, do not destroy order, but introduce new correlations with different translational symmetry. Thus incommensurate structures with domain walls are formed and the $c(2\times 2)$ is finally transformed into a $p(2\times 1)$ structure. Temperature-driven transitions at constant average densities from incommensurate to short-range order and finally to long-range order at high temperature can be described by simultaneous melting and domain wall evaporation.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2001-00488-0