Temperature-dependent anomalies in the structure of the (001) surface of LiCu2O2
| Autor: | Yangyang Yao, H.C. Hsu, M. El-Batanouny, Xuetao Zhu, Fangcheng Chou |
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| Rok vydání: | 2011 |
| Předmět: |
Diffraction
Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Chemistry Magnetism Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Surfaces and Interfaces Surface phonon Condensed Matter Physics Surfaces Coatings and Films Ion Condensed Matter - Strongly Correlated Electrons Condensed Matter::Superconductivity Lattice (order) Materials Chemistry Condensed Matter::Strongly Correlated Electrons Structural transition Helium atom scattering Normal |
| Zdroj: | Surface Science. 605:376-382 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2010.11.004 |
| Popis: | Surface corrugation functions, derived from elastic helium atom scattering (HAS) diffraction patterns at different temperatures, reveal that the Cu2+ rows in the (001) surface of LiCu2O2 undergo an outward displacement of about 0.15 {\AA} as the surface was cooled down to 140 K. This is probably the first time that isolated one-dimensional magnetic ion arrays were realized, which qualifies the Li1+Cu2+O2-2 surface as a candidate to study one-dimensional magnetism. The rising Cu2+ rows induce a surface incommensurate structural transition along the a-direction. Surface equilibrium analysis showed that the surface Cu2+ ions at bulk-like positions experience a net outward force along the surface normal which is relieved by the displacement. Temperature-dependent changes of the surface phonon dispersions obtained with the aid of inelastic HAS measurements combined with surface lattice dynamical calculations are also reported. Comment: 4 pages, 7 figures |
| Databáze: | OpenAIRE |
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