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We use inelastic neutron scattering (INS) to investigate the effect ofelectron correlations on spin dynamics in the iron-based superconductorBa$_{0.75}$K$_{0.25}$Fe$_{2}$As$_{2}$. Our INS data show a spin-wave-likedispersive feature, with a zone boundary energy of 200 meV. A first principlesanalysis of dynamical spin susceptibility, incorporating the massrenormalization factor of 3, as determined by angle-resolved photoemissionspectroscopy, provides a reasonable description of the observed spinexcitations. This analysis shows that electron correlations in the Fe-3$d$bands yield enhanced effective electron masses, and consequently, inducesubstantial narrowing of the spin excitation bandwidth. Our results highlightthe importance of electron correlations in an itinerant description of the spinexcitations in iron-based superconductors.

physical review. b./physical review. b

Effect of electron correlations on spin excitation bandwidth in  Ba$_{0.75}$K$_{0.25}$Fe$_{2}$As$_{2}$ as seen via time-of-flight inelastic  neutron scattering