Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering

Details Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering

2010-11-16

arxiv.org/abs/1011.3831v2

Phys. Rev. B. 83, 214519 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures, reformatted and lengthened for Phys. Rev. B regular article

Scientific paper

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 ~260meV. An analysis with the local-moment J_1-J2 model implies very different in-plane nearest-neighbor exchange parameters along the $a$ and $b$ directions, both in the orthorhombic and tetragonal phases. However, the spectrum calculated from the J1-J2 model deviates significantly from our data. We show that the qualitative features that cannot be described by the J1-J2 model are readily explained by calculations from a 5-band itinerant mean-field model.

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