title: Commensurate spin density wave in LaFeAsO: a local probe study.
abstract: We present a detailed study on the magnetic order in the undoped mother compound LaFeAsO of the recently discovered Fe-based superconductor LaFeAsO1-xFx. In particular, we present local probe measurements of the magnetic properties of LaFeAsO by means of 57Fe Mössbauer spectroscopy and muon-spin relaxation in zero external field along with magnetization and resistivity studies. These experiments prove a commensurate static magnetic order with a strongly reduced ordered moment of 0.25(5)muB at the iron site below T(N)=138 K, well separated from a structural phase transition at T(S)=156 K. The temperature dependence of the sublattice magnetization is determined and compared to theory. Using a four-band spin density wave model both, the size of the order parameter and the quick saturation below T(N) are reproduced.
authors.affiliation: Institut für Festkörperphysik, TU Dresden, D-01069 Dresden, Germany. h.klauss@physik.tu-dresden.de
authors.forename: H-H
authors.initials: HH
authors.lastname: Klauss
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authors.initials: H
authors.lastname: Luetkens
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authors.lastname: Klingeler
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authors.lastname: Hess
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authors.lastname: Drechsler
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authors.lastname: Khasanov
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authors.lastname: Amato
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authors.lastname: Hamann-Borrero
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authors.lastname: Leps
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authors.lastname: Werner
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authors.lastname: Büchner