Magnetic excitations in infinite-layer antiferromagnetic insulator

Keisuke Tomiyasu, Hiroshi Kageyama, Changhoon Lee, Mike H. Whangbo, Yoshihiro Tsujimoto, Kazuyoshi Yoshimura, Jon W. Taylor, Anna Llobet, Frans Trouw, Kazuhisa Kakurai, Kazuyoshi Yamada

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The magnetic excitations of an infinite-layer antiferromagnetic insulator SrFeO2 were examined by powder inelastic neutron scattering to find dispersive magnetic excitations from ∼15 up to 63 meV. The scattering intensity distribution is well described by a spin wave model, confirming that the out-of-plane direct FeFe exchange is comparable in strength to the in-plane Fe-O-Fe superexchange. SrFeO2 shows an additional magnetic excitation mode around 30 meV, which is suggestive of an orbital magnon arising from small orbital moment on Fe2+ brought about by spin-orbit coupling.

Original languageEnglish
Article number034707
Journaljournal of the physical society of japan
Volume79
Issue number3
DOIs
Publication statusPublished - 2010 Mar

Keywords

  • Mott insulator
  • Orbital angular momentum
  • Orbital wave
  • Spin wave

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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