Published in
American Physical Society, Physical review B, 5(84), 2011
DOI: 10.1103/physrevb.84.054419
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Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering
,
Y. Xiao,
S. Price,
Xf F. Wang,
Xh H. Chen,
J. Herrero-Martín,
C. Mazzoli,
Hc C. Walker,
L. Paolasini,
S. Francoual,
Dk K. Shukla,
J. Strempfer,
T. Chatterji ,
Cmn M. N. Kumar
and other authors.
Full text: Download
Abstract
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 $Γ_{5}$ 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. ; Comment: 8 pages, 7 figures, accepted for publication in Phys. Rev. B