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Resonant scattering and multiple Bragg X-ray diffraction in LaMnO3; a classical view.

Roberto Colella1, Qun Shen

  • 1Department of Physics, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907-2036, USA. colella@physics.purdue.edu

Acta Crystallographica. Section A, Foundations of Crystallography
|October 24, 2006
PubMed
Summary

This study resolves the controversy surrounding resonant scattering in LaMnO(3). Multiple Bragg scattering experiments confirm the Jahn-Teller distortion model (B) over the orbital ordering model (A).

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Area of Science:

  • Solid State Physics
  • Crystallography
  • Materials Science

Background:

  • The mechanism of resonant scattering in LaMnO(3) has been debated between two models: orbital ordering (A) and Jahn-Teller distortion (B).
  • These models predict different d-electron densities and structural interpretations, particularly concerning the forbidden 300 reflection.

Purpose of the Study:

  • To experimentally determine the correct model for resonant scattering in LaMnO(3).
  • To resolve the long-standing controversy between the orbital ordering and Jahn-Teller distortion models.

Main Methods:

  • Application of an experimental technique for phase determination using multiple Bragg scattering.
  • Analysis of experimental results to determine the sign of the structure factor F(300).

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Main Results:

  • Multiple-beam scattering results were found to be in agreement with model (B), which invokes the Jahn-Teller distortion.
  • The results contradicted model (A), which is based on orbital ordering.

Conclusions:

  • The Jahn-Teller distortion model (B) is confirmed as the correct mechanism for resonant scattering in LaMnO(3).
  • This study resolves the controversy by providing definitive experimental evidence, settling the debate between the two competing models.