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Title: Checkerboard-ordered pattern of Bi{sub 0.5}Sr{sub 0.5}MnO{sub 3} low-temperature phase probed by x-ray resonant scattering

Abstract

Resonant x-ray scattering (RXS) at the Mn K edge has been used to characterize the low temperature ordered phase of Bi{sub 0.5}Sr{sub 0.5}MnO{sub 3}. Strong resonances were observed for the (030), (050), (05/20), (0 7/2 0), (4 (1/2) 0), and (3 (1/2) 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 Mn{sup 3+} and Mn{sup 4+} 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 MnO{sub 6} cluster).more » We suggest a description of the RXS in terms of band structure effects and lattice dynamics.« less

Authors:
; ;  [1]; ;  [2];  [3]
  1. Instituto de Ciencia de Materiales de Aragon, Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza (Spain)
  2. Institut de Ciencia de Materials de Barcelona, CSIC, Campus Universitari de Bellaterra, E-08193 Bellaterra (Spain)
  3. Institute of Chemical Technology, Technicka 5, 16628 Prague 6 (Czech Republic)
Publication Date:
OSTI Identifier:
20788190
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 20; Other Information: DOI: 10.1103/PhysRevB.73.205107; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; ATOMS; BISMUTH COMPOUNDS; DOPED MATERIALS; GROUND STATES; JAHN-TELLER EFFECT; MAGNETORESISTANCE; MANGANATES; MANGANESE IONS; OXYGEN; PHOTONS; POLARIZATION; REFLECTION; RESONANCE; RESONANCE SCATTERING; STRONTIUM COMPOUNDS; TEMPERATURE DEPENDENCE; VALENCE; X RADIATION; X-RAY DIFFRACTION

Citation Formats

Subias, G., Garcia, J., Sanchez, M. C., Beran, P., Garcia-Munoz, J. L., and Nevriva, M. Checkerboard-ordered pattern of Bi{sub 0.5}Sr{sub 0.5}MnO{sub 3} low-temperature phase probed by x-ray resonant scattering. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.2.
Subias, G., Garcia, J., Sanchez, M. C., Beran, P., Garcia-Munoz, J. L., & Nevriva, M. Checkerboard-ordered pattern of Bi{sub 0.5}Sr{sub 0.5}MnO{sub 3} low-temperature phase probed by x-ray resonant scattering. United States. doi:10.1103/PHYSREVB.73.2.
Subias, G., Garcia, J., Sanchez, M. C., Beran, P., Garcia-Munoz, J. L., and Nevriva, M. Mon . "Checkerboard-ordered pattern of Bi{sub 0.5}Sr{sub 0.5}MnO{sub 3} low-temperature phase probed by x-ray resonant scattering". United States. doi:10.1103/PHYSREVB.73.2.
@article{osti_20788190,
title = {Checkerboard-ordered pattern of Bi{sub 0.5}Sr{sub 0.5}MnO{sub 3} low-temperature phase probed by x-ray resonant scattering},
author = {Subias, G. and Garcia, J. and Sanchez, M. C. and Beran, P. and Garcia-Munoz, J. L. and Nevriva, M.},
abstractNote = {Resonant x-ray scattering (RXS) at the Mn K edge has been used to characterize the low temperature ordered phase of Bi{sub 0.5}Sr{sub 0.5}MnO{sub 3}. Strong resonances were observed for the (030), (050), (05/20), (0 7/2 0), (4 (1/2) 0), and (3 (1/2) 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 Mn{sup 3+} and Mn{sup 4+} 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 MnO{sub 6} cluster). We suggest a description of the RXS in terms of band structure effects and lattice dynamics.},
doi = {10.1103/PHYSREVB.73.2},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 20,
volume = 73,
place = {United States},
year = {Mon May 15 00:00:00 EDT 2006},
month = {Mon May 15 00:00:00 EDT 2006}
}