Itinerant magnetic excitations in antiferromagnetic CaFe2As2
S.O. Diallo, V.P. Antropov, T.G. Perring, C. Broholm, J.J. Pulikkotil,, N. Ni, S.L. Bud'ko, P.C. Canfield, A. Kreyssig, A.I. Goldman, and R.J., McQueeney
TL;DR
This study investigates magnetic excitations in CaFe2As2 using neutron scattering, revealing well-defined low-energy spin waves and broader high-energy excitations, with theoretical analysis indicating damping by particle-hole excitations.
Contribution
It provides detailed experimental data on magnetic excitations in CaFe2As2 and combines it with ab-initio calculations to explain high-energy damping effects.
Findings
Low energy spin waves fit a Heisenberg model
High energy excitations are broader and damped
High energy behavior dominated by particle-hole damping
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.
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