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. 2008 Aug 15;101(7):077005.
doi: 10.1103/PhysRevLett.101.077005. Epub 2008 Aug 14.

Commensurate spin density wave in LaFeAsO: a local probe study

H-H Klauss  1 , H Luetkens, R Klingeler, C Hess, F J Litterst, M Kraken, M M Korshunov, I Eremin, S-L Drechsler, R Khasanov, A Amato, J Hamann-Borrero, N Leps, A Kondrat, G Behr, J Werner, B Büchner
Affiliations

Commensurate spin density wave in LaFeAsO: a local probe study

H-H Klauss et al. Phys Rev Lett. .

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.

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