| Issue |
Europhys. Lett.
Volume 56, Number 1, October 2001
|
|
|---|---|---|
| Page(s) | 67 - 73 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00488-0 | |
| Published online | 01 December 2003 | |
Impurity-induced changes of overlayer symmetry and of phase transitions
1
Institut für Festkörperphysik, Universität Hannover
Appelstr. 2, D-30167, Hannover, Germany
2
Institute of Physics NANU - Kiev, Ukraine and
Department of Physics, Texas A& M University -
College Station, TX 77843-4242, USA
Received:
9
April
2001
Accepted:
6
July
2001
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 
structure, do
not destroy order, but introduce new correlations with different
translational symmetry. Thus incommensurate structures with domain walls are
formed and the is finally transformed into a 
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.
PACS: 68.55.Ln – Defects and impurities: doping, implantation, distribution, concentration etc / 68.35.Md – Surface thermodynamics, surfaces energies / 68.35.Rh – Phase transitions and critical phenomena
© EDP Sciences, 2001
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