Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-07-09
Phys. Rev. B 84, 054419 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.84.054419
The magnetic structures adopted by the Fe and Sm sublattices in SmFeAsO have been investigated using element specific x-ray resonant and non-resonant magnetic scattering techniques. Between 110 and 5 K, the Sm and Fe moments are aligned along the c and a directions, respectively according to the same magnetic representation $\Gamma_{5}$ and the same propagation vector (1, 0, 0.5). Below 5 K, magnetic order of both sublattices change to a different magnetic structure and the Sm moments reorder in a magnetic unit cell equal to the chemical unit cell. Modeling of the temperature dependence for the Sm sublattice as well as a change in the magnetic structure below 5 K provide a clear evidence of a surprisingly strong coupling between the two sublattices, and indicate the need to include anisotropic exchange interactions in models of SmFeAsO and related compounds.
Brückel Th
Chatterji Tapan
Chen Hua-Xing
Francoual S.
Herrero-Martin Javier
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