The European Physical Journal B

, Volume 74, Issue 4, pp 457–461 | Cite as

Soft X-ray resonant scattering study of single-crystal LaSr2Mn2O7

  • H.-F. Li
  • Y. Su
  • Tapan Chatterji
  • A. Nefedov
  • J. Persson
  • P. Meuffels
  • Y. Xiao
  • D. Vaknin
  • Th. Brückel
Solid State and Materials

Abstract

Soft X-ray resonant scattering studies at the Mn LII, III- and the La MIV, V- edges of single-crystal LaSr2Mn2O7 are reported. At low temperatures, below TN ≈ 160 K, energy scans with a fixed momentum transfer at the A-type antiferromagnetic (0 0 1) reflection around the Mn LII, III-edges with incident linear σ and π polarizations show strong resonant enhancements. The splitting of the energy spectra around the Mn LII, III-edges may indicate the presence of a mixed valence state, e.g., Mn3+/Mn4+. The relative intensities of the resonance and the clear shoulder-feature as well as the strong incident σ and π polarization dependences strongly indicate its complex electronic origin. Unexpected enhancement of the charge Bragg (0 0 2) reflection at the La MIV, V-edges with σ polarization has been observed up to 300 K, with an anomaly appearing around the orbital-ordering transition temperature, TOO ≈ 220 K, suggesting a strong coupling (competition) between them.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • H.-F. Li
    • 1
    • 2
  • Y. Su
    • 1
  • Tapan Chatterji
    • 1
    • 3
  • A. Nefedov
    • 4
  • J. Persson
    • 1
  • P. Meuffels
    • 1
  • Y. Xiao
    • 1
  • D. Vaknin
    • 2
  • Th. Brückel
    • 1
  1. 1.Forschungszentrum Jülich GmbHInstitut für FestkörperforschungJülichGermany
  2. 2.Ames Laboratory and Department of Physics and Astronomy, Iowa State UniversityAmesUSA
  3. 3.Institut Laue-LangevinGrenoble Cedex 9France
  4. 4.Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität BochumBochumGermany

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