Itinerant spin excitations in SrFe2As2 measured by inelastic neutron scattering

作者：Ewings R A^*; Perring T G; Gillett J; Das S D; Sebastian S E; Taylor A E; Guidi T; Boothroyd A T

来源：Physical Review B, 2011, 83(21): 214519.

DOI：10.1103/PhysRevB.83.214519

We report inelastic neutron-scattering measurements of the magnetic excitations in SrFe2As2, the parent of a family of iron-based superconductors. The data extend throughout the Brillouin zone and up to energies of similar to 260 meV. The spectrum calculated from a J(1)-J(2) model does not accurately describe our data, and we show that some of the qualitative features that the model fails to describe are readily explained by calculations from a five-band itinerant mean-field model. In particular, the high-energy part of the spectra recorded above T-N do not differ significantly from those at low temperature, which is explained by the itinerant model and which has implications for theories of electronic nematic and orbital ordering.

• 出版日期2011-6-15