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Title: The Checkerboard Pattern of the Charge-Ordered Phases in Bi1-xSrxMnO3 (x{<=}0.5) Studied by Resonant X-Ray Scattering at the Mn K Edge

Abstract

We report here resonant x-ray scattering (RXS) experiments carried out at the Mn K edge in Bi1-xSrxMnO3 (x=0.3, 0.5) single-crystals at room temperature. These compounds show a so-called charge ordered (CO) state at room temperature. Strong resonances were observed as the photon energy is tuned through the Mn K-edge for several weak superstructure (h 0 0) and (0 k 0) and forbidden (h/2 0 0) and (0 k/2 0) reflections with h, k odd within the a-b plane (Ibmm setting) in the x=0.3 and x=0.5 compounds, respectively. The reported azimuth angle and polarization dependences of the resonant intensity for the complete set of reflections point out to a structural transition at TCO that stabilizes a checkerboard ordering of two non-equivalent Mn atoms with different local geometrical structures. We conclude that the checkerboard ordered phase is a common ground state in the so-called CO manganites, A1-xBxMnO3, independently of the nature of the A and B atoms and for compositions x even far from 0.5. Moreover, the quantitative analysis of the resonant reflections shows that the electronic states of the two non-equivalent Mn atoms are far from the ionic (+3 and +4) species.

Authors:
; ;  [1]; ;  [2];  [3]
  1. Instituto de Ciencia de Materiales de Aragon ICMA, 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:
21054628
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644525; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMS; BISMUTH COMPOUNDS; CARBON MONOXIDE; CONCENTRATION RATIO; CRYSTAL STRUCTURE; ELECTRONIC STRUCTURE; GROUND STATES; MANGANATES; MONOCRYSTALS; PHOTONS; POLARIZATION; REFLECTION; RESONANCE; RESONANCE SCATTERING; STRONTIUM COMPOUNDS; X-RAY DIFFRACTION

Citation Formats

Subias, G., Garcia, J., Sanchez, M. C., Beran, P., Garcia-Munoz, J. L., and Nevriva, M. The Checkerboard Pattern of the Charge-Ordered Phases in Bi1-xSrxMnO3 (x{<=}0.5) Studied by Resonant X-Ray Scattering at the Mn K Edge. United States: N. p., 2007. Web. doi:10.1063/1.2644525.
Subias, G., Garcia, J., Sanchez, M. C., Beran, P., Garcia-Munoz, J. L., & Nevriva, M. The Checkerboard Pattern of the Charge-Ordered Phases in Bi1-xSrxMnO3 (x{<=}0.5) Studied by Resonant X-Ray Scattering at the Mn K Edge. United States. doi:10.1063/1.2644525.
Subias, G., Garcia, J., Sanchez, M. C., Beran, P., Garcia-Munoz, J. L., and Nevriva, M. Fri . "The Checkerboard Pattern of the Charge-Ordered Phases in Bi1-xSrxMnO3 (x{<=}0.5) Studied by Resonant X-Ray Scattering at the Mn K Edge". United States. doi:10.1063/1.2644525.
@article{osti_21054628,
title = {The Checkerboard Pattern of the Charge-Ordered Phases in Bi1-xSrxMnO3 (x{<=}0.5) Studied by Resonant X-Ray Scattering at the Mn K Edge},
author = {Subias, G. and Garcia, J. and Sanchez, M. C. and Beran, P. and Garcia-Munoz, J. L. and Nevriva, M.},
abstractNote = {We report here resonant x-ray scattering (RXS) experiments carried out at the Mn K edge in Bi1-xSrxMnO3 (x=0.3, 0.5) single-crystals at room temperature. These compounds show a so-called charge ordered (CO) state at room temperature. Strong resonances were observed as the photon energy is tuned through the Mn K-edge for several weak superstructure (h 0 0) and (0 k 0) and forbidden (h/2 0 0) and (0 k/2 0) reflections with h, k odd within the a-b plane (Ibmm setting) in the x=0.3 and x=0.5 compounds, respectively. The reported azimuth angle and polarization dependences of the resonant intensity for the complete set of reflections point out to a structural transition at TCO that stabilizes a checkerboard ordering of two non-equivalent Mn atoms with different local geometrical structures. We conclude that the checkerboard ordered phase is a common ground state in the so-called CO manganites, A1-xBxMnO3, independently of the nature of the A and B atoms and for compositions x even far from 0.5. Moreover, the quantitative analysis of the resonant reflections shows that the electronic states of the two non-equivalent Mn atoms are far from the ionic (+3 and +4) species.},
doi = {10.1063/1.2644525},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}