High energy spin excitations in BaFe2As2

R. A. Ewings; T. G. Perring; R. I. Bewley; T. Guidi; M. J. Pitcher; D. R. Parker; S. J. Clarke; A. T. Boothroyd

doi:10.1103/PhysRevB.78.220501

High energy spin excitations in BaFe2As2

Superconductivity 2008-12-08 v2 Strongly Correlated Electrons

Authors: R. A. Ewings , T. G. Perring , R. I. Bewley , T. Guidi , M. J. Pitcher , D. R. Parker , S. J. Clarke , A. T. Boothroyd

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Abstract

We report neutron scattering measurements of cooperative spin excitations in antiferromagnetically ordered BaFe2As2, the parent phase of an iron pnictide superconductor. The data extend up to ~100meV and show that the spin excitation spectrum is sharp and highly dispersive. By fitting the spectrum to a linear spin-wave model we estimate the magnon bandwidth to be in the region of 0.17eV. The large characteristic spin fluctuation energy suggests that magnetism could play a role in the formation of the superconducting state.

Keywords

spin excitations in condensed matter unconventional superconductivity magnetism

Cite

@article{arxiv.0808.2836,
  title  = {High energy spin excitations in BaFe2As2},
  author = {R. A. Ewings and T. G. Perring and R. I. Bewley and T. Guidi and M. J. Pitcher and D. R. Parker and S. J. Clarke and A. T. Boothroyd},
  journal= {arXiv preprint arXiv:0808.2836},
  year   = {2008}
}

Comments

4 pages, 4 figures; v2: minor changes to the text and abstract and more general expressions for the linear spin-wave cross section included

High energy spin excitations in BaFe2As2

Abstract

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