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The spin excitations remain isotropic up to the high excitation energy, ${\\hbar\\omega}= 78$ meV. The excitations gradually become broad and damped above 40 meV. The damping parameter ${\\gamma}$ reaches 110(16) meV at ${\\hbar\\omega} = 78$ meV, which is much larger than that for other metallic compounds, e.g., CaFe$_2$As$_2$ (24 meV), La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ ($52-72$ meV), and Mn$_{90}$Cu$_{10}$ (88 meV). 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Ibuka, S. Itoh, T. Yokoo, Y. Endoh","submitted_at":"2016-12-08T02:57:26Z","abstract_excerpt":"The collective spin-wave excitations in the antiferromagnetic state of $\\gamma$-Fe$_{0.7}$Mn$_{0.3}$ were investigated using the inelastic neutron scattering technique. The spin excitations remain isotropic up to the high excitation energy, ${\\hbar\\omega}= 78$ meV. The excitations gradually become broad and damped above 40 meV. The damping parameter ${\\gamma}$ reaches 110(16) meV at ${\\hbar\\omega} = 78$ meV, which is much larger than that for other metallic compounds, e.g., CaFe$_2$As$_2$ (24 meV), La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ ($52-72$ meV), and Mn$_{90}$Cu$_{10}$ (88 meV). 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