Impurity-induced changes of overlayer symmetry and of phase transitions

Autor:	Herbert Pfnür, G. Godzik, Igor F. Lyuksyutov
Rok vydání:	2001
Předmět:	Phase transition Domain wall (magnetism) Materials science Low-energy electron diffraction Condensed matter physics Impurity Monolayer General Physics and Astronomy Translational symmetry Superstructure (condensed matter) Overlayer
Zdroj:	Europhysics Letters (EPL). 56:67-73
ISSN:	1286-4854 0295-5075
DOI:	10.1209/epl/i2001-00488-0
Popis:	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 × 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 × 2) is finally transformed into a p(2 × 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::78f366b051388dceda710ac08ed086b9 https://doi.org/10.1209/epl/i2001-00488-0 Zobrazit plný text záznamu