TY  - JOUR
AU  - Nandi, S.
AU  - Su, Y.
AU  - Xiao, Y.
AU  - Price, S.
AU  - Wang, X. F.
AU  - Chen, X. H.
AU  - Herrero-Martín, J.
AU  - Mazzoli, C.
AU  - Walker, H. C.
AU  - Paolasini, L.
AU  - Francoual, S.
AU  - Shukla, D. K.
AU  - Strempfer, J.
AU  - Chatterji, T.
AU  - Kumer, C. M. N.
AU  - Mittal, R.
AU  - Ronnow, H. M.
AU  - Rüegg, Ch.
AU  - McMorrow, D. F.
AU  - Brückel, T.
TI  - Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering
JO  - Physical review / B
VL  - 84
IS  - 5
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-16086
SP  - 054419
PY  - 2011
N1  - Record converted from VDB: 12.11.2012
AB  - The magnetic structures adopted by the Fe and Sm sublattices in SmFeAsO have been investigated using element-specific x-ray resonant and nonresonant 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 1/2). Below 5 K, the magnetic order of both sublattices changes 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, provides clear evidence of a surprisingly strong coupling between the two sublattices, and indicates the need to include anisotropic exchange interactions in models of SmFeAsO and related compounds.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000293553100011
DO  - DOI:10.1103/PhysRevB.84.054419
UR  - https://juser.fz-juelich.de/record/16086
ER  -