Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering

Nandi, S.; Rüegg, Ch.; Wang, X. F.; Xiao, Y.; Chen, X. H.; Price, S.; Brückel, T.; Kumer, C. M. N.; Strempfer, J.; McMorrow, D. F.; Chatterji, T.; Mittal, R.; Herrero-Martín, J.; Walker, H. C.; Francoual, S.; Shukla, D. K.; Mazzoli, C.; Su, Y.; Paolasini, L.; Ronnow, H. M.

doi:10.1103/PhysRevB.84.054419

Journal Article

Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering

Nandi, S.FZJ* ; Su, Y.FZJ* ; Xiao, Y.FZJ* ; Price, S.FZJ* ; Wang, X. F. ; Chen, X. H. ; Herrero-Martín, J. ; Mazzoli, C. ; Walker, H. C. ; Paolasini, L. ; Francoual, S. ; Shukla, D. K. ; Strempfer, J. ; Chatterji, T.FZJ* ; Kumer, C. M. N.FZJ* ; Mittal, R.FZJ* ; Ronnow, H. M. ; Rüegg, C. ; McMorrow, D. F. ; Brückel, T.FZJ*

2011
APS College Park, Md.

Physical review / B 84(5), 054419 (2011) [10.1103/PhysRevB.84.054419]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10927 doi:10.1103/PhysRevB.84.054419

Abstract: 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.

Keyword(s): Basic research (1st) ; Others (1st) ; Magnetism (2nd) ; J

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