Two-Dimensional Spin Density Wave State in LaFeAsO

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=140 K exhibits a prominent asymmetric peak ascribed to the (π,π,l) magnetic rod, suggesting the two-...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2009-04, Vol.78 (4), p.43705
Main Authors: ISHIKADO, Motoyuki, KAJIMOTO, Ryoichi, HOSONO, Hideo, GUIDI, Tatiana, BEWLEY, Robert, BENNINGTON, Stephen M, SHAMOTO, Shin-Ichi, ARAI, Masatoshi, IYO, Akira, MIYAZAWA, Kiichi, SHIRAGE, Parasharam M, KITO, Hijiri, EISAKI, Hiroshi, KIM, Sungwng
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary: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=140 K exhibits a prominent asymmetric peak ascribed to the (π,π,l) 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 J2 between next-nearest-neighbour Fe magnetic moments in a single Fe square lattice.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.78.043705