Commensurate spin density wave in LaFeAsO: a local probe study |
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Authors: | Klauss H-H Luetkens H Klingeler R Hess C Litterst F J Kraken M Korshunov M M Eremin I Drechsler S-L Khasanov R Amato A Hamann-Borrero J Leps N Kondrat A Behr G Werner J Büchner B |
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Institution: | Institut für Festk?rperphysik, TU Dresden, D-01069 Dresden, Germany. h.klauss@physik.tu-dresden.de |
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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 M?ssbauer 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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