Details

Autor(en) / Beteiligte

• 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

Titel

Commensurate spin density wave in LaFeAsO: a local probe study

Ist Teil von

• Physical review letters, 2008-08, Vol.101 (7), p.077005-077005, Article 077005

Ort / Verlag

United States

Erscheinungsjahr

2008

Quelle

APS: American Physical Society E-Journals (Physics)

Beschreibungen/Notizen

• 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.