Theory of resonant X-ray scattering as a probe to detect the orbital orderings and excitations in CMR manganites

Sumio Ishihara, Sadamichi Maekawa

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

The orbital degree of freedom in transition-metal ions is recognized to be one of the indispensable ingredients to uncover anomalous electronic properties observed in several transition-metal oxides, as well as colossal magnetoresistive (CMR) manganites. Recently, much experimental development in this research field has been achieved by utilizing synchrotron radiation; orbital ordering was directly observed by resonant X-ray scattering (RXS). We theoretically study RXS as a probe to detect the orbital orderings and excitations in CMR manganites. We identify an origin of the anisotropy of the atomic scattering factor (ASF) in the orbital-ordered state and calculate the energy, polarization and orbital dependences of ASF and the scattering intensity. We develop a theory of RXS, where the scattering cross section is represented by the correlation function of the pseudospin operators for the orbital degree of freedom. Recent RXS experiments in orbital-ordered compounds are briefly reviewed.

Original languageEnglish
Pages (from-to)21-30
Number of pages10
JournalJournal of Magnetism and Magnetic Materials
Volume233
Issue number1-2
DOIs
Publication statusPublished - 2001 Jul 1
EventProceedings of the Workshop on Applications of Synchrotron Light to Magnetic Materials - Campinas, SP, Brazil
Duration: 2000 Aug 142000 Aug 16

Keywords

  • Inelastic X-ray scattering
  • Manganites
  • Orbital degree of freedom
  • Orbital ordering
  • Resonant X-ray scattering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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