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Longitudinal spin excitations and magnetic anisotropy in antiferromagnetically ordered BaFe2As2

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arxiv 1309.7553 v1 pith:YJOLV6U6 submitted 2013-09-29 cond-mat.supr-con cond-mat.str-el

Chong Wang , Rui Zhang , Fa Wang , Huiqian Luo , L. P. Regnault , Pengcheng Dai , Yuan Li This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords anisotropyantiferromagneticallybafe2as2componentsdirectionlongitudinalmagneticordered
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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.

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