Commensurate Spin Density Wave in LaFeAsO: A Local Probe Study

H.-H. Klauss, 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, and B. Büchner
Phys. Rev. Lett. 101, 077005 – Published 14 August 2008

Abstract

We present a detailed study on the magnetic order in the undoped mother compound LaFeAsO of the recently discovered Fe-based superconductor LaFeAsO1xFx. In particular, we present local probe measurements of the magnetic properties of LaFeAsO by means of Fe57 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)μB at the iron site below TN=138K, well separated from a structural phase transition at TS=156K. 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 TN are reproduced.

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  • Received 2 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.077005

©2008 American Physical Society

Authors & Affiliations

H.-H. Klauss1,*, H. Luetkens2, R. Klingeler3, C. Hess3, F. J. Litterst4, M. Kraken4, M. M. Korshunov5,6, I. Eremin5,7, S.-L. Drechsler3, R. Khasanov2, A. Amato2, J. Hamann-Borrero3, N. Leps3, A. Kondrat3, G. Behr3, J. Werner3, and B. Büchner3

  • 1Institut für Festkörperphysik, TU Dresden, D-01069 Dresden, Germany
  • 2Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 3Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany
  • 4Institut für Physik der Kondensierten Materie, TU Braunschweig, D-38106 Braunschweig, Germany
  • 5Max-Planck-Institut für Physik Komplexer Systeme, D-01187 Dresden, Germany
  • 6L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
  • 7Institut für Mathematische Physik, TU Braunschweig, D-38106 Braunschweig, Germany

  • *h.klauss@physik.tu-dresden.de

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Vol. 101, Iss. 7 — 15 August 2008

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