Commensurate spin density wave in LaFeAsO: a local probe study

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.

doi:10.1103/PhysRevLett.101.077005

Commensurate spin density wave in LaFeAsO: a local probe study

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

Citation

Klauss, H. H., Luetkens, H., Klingeler, R., Hess, C., Litterst, F. J., Kraken, M., … Büchner, B. (2008). Commensurate spin density wave in LaFeAsO: a local probe study. Physical Review Letters, 101(7), 077005 (4 pp.). https://doi.org/10.1103/PhysRevLett.101.077005

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:18934

We present a detailed study on the magnetic order in the undoped mother compound LaFeAsO of the recently discovered Fe-based superconductor LaFeAsO_1−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)μ_B 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.