Resonant X-ray study on the Bi-layered perovskite Mn oxide LaSr 2Mn2O7

Yusuke Wakabayashi, Youichi Murakami, Ichiro Koyama, Tsuyoshi Kimura, Yoshinori Tokura, Yutaka Moritomo, Yasuo Endoh, Kazuma Hirota

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Charge and orbital ordering behaviors in the half doped bi-layered compound LaSr2Mn2O7 have been studied by resonant and non-resonant x-ray scattering. Three different order parameters, which correspond to the A-type antiferromagnetism, charge ordering and orbital ordering, were observed by measuring the magnetostriction and the superlattice peaks characterized by wavevectors (1/2 1/2 0) and (1/4 1/4 0), respectively. The superlattice reflections indicating the charge and orbital ordered states were observed below 210 K. Both the intensities reach a maximum at 160 K on cooling and become very weak below 100 K. The peak width of the charge ordered state agrees with that of the orbital ordered state at all temperatures studied. These results indicate that both the states originate from a single phase and that the charge/orbital ordered islands with definite interfaces disperse in the A-type antiferromagnetic phase. The dimensionality of the charge/orbital ordered phase is discussed using this model.

Original languageEnglish
Pages (from-to)618-626
Number of pages9
Journaljournal of the physical society of japan
Volume72
Issue number3
DOIs
Publication statusPublished - 2003 Mar

Keywords

  • Charge order
  • Layered structure
  • Orbital order
  • X-ray scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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