Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/19463
Share/Impact:
Título : Checkerboard-ordered pattern of Bi0.5Sr0.5MnO3 low-temperature phase probed by x-ray resonant scattering
Autor : Subías, G., García, Joaquín, Beran, P., Sánchez, María Concepción, García-Muñoz, J. L.
Palabras clave : Bismuth compounds
Strontium compounds
X-ray scattering
Ground states
Lattice dynamics
Colossal magnetoresistance
Jahn-Teller effect
Fecha de publicación : May-2006
Editor: American Physical Society
Citación : Physical Review - Section B - Condensed Matter 73(20): 205107.1-205107.13 (2006)
Resumen: Resonant x-ray scattering (RXS) at the Mn K edge has been used to characterize the low temperature ordered phase of Bi0.5Sr0.5MnO3. Strong resonances were observed for the (030), (050), (05/20), (0 7/2 0), (4 0), and (3 0) reflections as the photon energy is tuned through the Mn K edge. The reported azimuthal and polarization dependence of the resonant intensities indicates that the low temperature phase is described as a checkerboard ordering of two types of Mn sites with different local geometrical structures. One of the sites is anisotropic, a tetragonal distorted oxygen octahedron and the other one is isotropic, a nearly undistorted oxygen octahedron. The distinction of these two Mn sites is accompanied by a displacement of the Mn atoms transverse to the b axis. We conclude that this checkerboard-ordered pattern is a common ground state in half-doped manganites. Intermediate valence states according to fractional charge segregation were deduced for the two nonequivalent Mn atoms, far from the localized Mn3+ and Mn4+ ionic species. Hence, the experimental data discard the ionic model of charge and orbital ordering of localized 3d (or 3d-like) states at the Mn site (or the MnO6 cluster). We suggest a description of the RXS in terms of band structure effects and lattice dynamics.
Descripción : 13 pages, 12 figures.-- PACS number(s): 75.47.Lx, 61.10.-i, 71.30.+h
Versión del editor: http://dx.doi.org/10.1103/PhysRevB.73.205107
URI : http://hdl.handle.net/10261/19463
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.73.205107
Citación : Physical Review - Section B - Condensed Matter 73(20): 205107.1-205107.13 (2006)
Appears in Collections:(ICMA) Artículos
(ICMAB) Artículos

Files in This Item:
There are no files associated with this item.
Show full item record
 
CSIC SFX LinksSFX Query


Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.