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Persistent URL http://purl.org/net/epubs/work/50814
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Record Id 50814
Title Itinerant magnetic excitations in antiferromagnetic CaFe2As2
Abstract Neutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe2As2 reveal steeply dispersive and well-defined spin waves up to an energy of ~100 meV. Magnetic excitations above 100 meV and up to the maximum energy of 200 meV are however broader in energy and momentum than the experimental resolution. While the low energy modes can be fit to a Heisenberg model, the total spectrum cannot be described as arising from excitations of a local moment system. Ab initio calculations of the dynamic magnetic susceptibility suggest that the high energy behavior is dominated by the damping of spin waves by particle-hole excitations.
Organisation ISIS , ISIS-MAPS , STFC
Keywords Physics
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Language English (EN)
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Journal Article Phys Rev Lett 102 (2009): 187206. doi:10.1103/PhysRevLett.102.187206 PhysRevLett_102_187206.pdf 2009