Two-dimensional spin density wave state in LaFeAsO

Motoyuki Ishtkado, Ryoichi Kajtmoto, Shin Ichi Shamoto, Masatoshi Arai, Akira Iyo, Kiichi Miyazawa, Parasharam M. Shirage, Hijiri Kito, Hiroshi Eisaki, Sungwng Kim, Hideo Hosono, Tatiana Guidi, Robert Bewley, Stephen M. Bennington

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


The parent compound of the Fe oxypnictide superconductor, LaFeAsO, has been studied by pulsed neutron powder inelastic scattering measurement. The inelastic scattering intensity along the Q-axis at T = 140K exhibits a prominent asymmetric peak ascribed to the (π, π, I) magnetic rod, suggesting the two-dimensionality of the spin density wave above the magnetic transition temperature. It persists even in the tetragonal phase up to room temperature, which is well above the magnetic transition temperature, corresponding to two antiferromagnetic sublattices or domains with a strong effective antiferromagnetic interaction J 2 between next-nearest-neighbour Fe magnetic moments in a single Fe square lattice.

Original languageEnglish
Article number043705
JournalJournal of the Physical Society of Japan
Issue number4
Publication statusPublished - 2009 Apr

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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