2010/04/05 by Xuetao Zhu, Yangyang Yao, H. C. Hsu +3 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Composite material #Condensed matter physics #Diffraction #Displacement (psychology) #Ferroelectric and Piezoelectric Materials #Geometry #Ion #Lattice (music) #Magnetism #Materials science #Multiferroics and related materials #Optics #Phonon #Physics #Scattering #Surface (topology) #Surface energy #Surface phonon #Surface stress #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1016/j.susc.2010.11.004
published as Surf. Sci. 605 (2011) 376-382 · 4 pages, 7 figures
arxiv created 2010/04/05 · openalex publication_date 2010/11/22 · arxiv updated 2015/03/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Å 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.