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Two-dimensional spin density wave state in LaFeAsO

Ishikado, Motoyuki; Kajimoto, Ryoichi  ; Shamoto, Shinichi  ; Arai, Masatoshi; Iyo, Akira*; Miyazawa, Kiichi*; Shirage, P. M.*; Kito, Hijiri*; Eisaki, Hiroshi*; Kim, S.-W.*; Hosono, Hideo*; Guidi, T.*; Bewley, R.*; Bennington, S. M.*

The parent compound of Fe oxypnictide superconductor, LaFeAsO, has been studied by pulsed neutron powder inelastic scattering measurement at MERLIN in ISIS. The inelastic scattering intensity along $$Q$$-axis at $$T$$ = 140 K exhibits a prominent asymmetric peak ascribed to 2-dimensional magnetic rod. It persists even in the tetragonal phase up to room temperature, suggesting the existence of strong magnetic interaction.

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Category:Physics, Multidisciplinary

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