Abstract
We report inelastic neutron-scattering measurements of the magnetic excitations in SrFeAs, the parent of a family of iron-based superconductors. The data extend throughout the Brillouin zone and up to energies of meV. The spectrum calculated from a - 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 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.
- Received 20 April 2011
DOI:https://doi.org/10.1103/PhysRevB.83.214519
©2011 American Physical Society