Longitudinal spin excitations and magnetic anisotropy in antiferromagnetically ordered BaFe2As2

Chong Wang; Rui Zhang; Fa Wang; Huiqian Luo; L. P. Regnault; Pengcheng Dai; Yuan Li

Longitudinal spin excitations and magnetic anisotropy in antiferromagnetically ordered BaFe2As2

Superconductivity 2014-01-09 v1 Strongly Correlated Electrons

Authors: Chong Wang , Rui Zhang , Fa Wang , Huiqian Luo , L. P. Regnault , Pengcheng Dai , Yuan Li

Abstract

We report on a spin-polarized inelastic neutron scattering study of spin waves in the antiferromagnetically ordered state of BaFe2As2. Three distinct excitation components are identified, with spins fluctuating along the c-axis, perpendicular to the ordering direction in the ab-plane, and parallel to the ordering direction. While the first two "transverse" components can be described by a linear spin-wave theory with magnetic anisotropy and inter-layer coupling, the third "longitudinal" component is generically incompatible with the local moment picture. It points towards a contribution of itinerant electrons to the magnetism already in the parent compound of this family of Fe-based superconductors.

Keywords

spin excitations magnetic anisotropy BaFe2As2 inelastic neutron scattering antiferromagnetic order itinerant electrons

Cite

@article{arxiv.1309.7553,
  title  = {Longitudinal spin excitations and magnetic anisotropy in antiferromagnetically ordered BaFe2As2},
  author = {Chong Wang and Rui Zhang and Fa Wang and Huiqian Luo and L. P. Regnault and Pengcheng Dai and Yuan Li},
  journal= {arXiv preprint arXiv:1309.7553},
  year   = {2014}
}

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4 pages, 4 figures, plus Supplemental Material

Longitudinal spin excitations and magnetic anisotropy in antiferromagnetically ordered BaFe2As2

Abstract

Keywords

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