Journal
PHYSICAL REVIEW X
Volume 3, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.3.041036
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Funding
- NBRP of China [2013CB921903, 2011CBA00110, 2012CB821400]
- NSF of China [11374024, 11374011, 91221303]
- NPL, CAEP [2013DB03]
- U.S. NSF [DMR-1063866, NSF OISE-0968226]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1063866] Funding Source: National Science Foundation
- Office Of Internatl Science &Engineering
- Office Of The Director [0968226] Funding Source: National Science Foundation
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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 interlayer coupling, the third longitudinal component is generically incompatible with the local-moment picture. It points toward a contribution of itinerant electrons to the magnetism that is already in the parent compound of this family of Fe-based superconductors.
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