Magnetic form factor of SrFe$_2$As$_2$

Details Magnetic form factor of SrFe$_2$As$_2$ Magnetic form factor of SrFe$_2$As$_2$

2010-01-12

arxiv.org/abs/1001.1941v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.81.140502

Neutron diffraction measurements have been carried out to investigate the magnetic form factor of the parent SrFe2As2 system of the iron-based superconductors. The general feature is that the form factor is approximately isotropic in wave vector, indicating that multiple d-orbitals of the iron atoms are occupied as expected based on band theory. Inversion of the diffraction data suggests that there is some elongation of the spin density toward the As atoms. We have also extended the diffraction measurements to investigate a possible jump in the c-axis lattice parameter at the structural phase transition, but find no detectable change within the experimental uncertainties.

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