Out-of-plane intensity modulation of spin susceptibility in Ba_0.75K_0.25Fe₂As₂ as seen via time-of-flight neutron spectroscopy

2024/12/22 by Murai, Naoki, Suzuki, Katsuhiro, Nakajima, Masamichi +4
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.2412.16870

Abstract

We present a time-of-flight inelastic neutron scattering study of the iron-based superconductor Ba_0.75K_0.25Fe₂As₂, focusing on its spin dynamics. Our measurements reveal a periodic intensity modulation of magnetic signals along the out-of-plane direction, which deviates from the behavior typically expected for two-dimensional magnetic materials. Using an effective model derived from density functional theory calculations, we demonstrate that the observed out-of-plane modulated spin susceptibility originates from the intrinsic three-dimensionality of the electronic band structure. Our study reveals the limitations of the widely assumed two-dimensional nature of spin susceptibility in iron-based superconductors, highlighting the importance of incorporating three-dimensional aspects of the electronic band structure for accurate modeling of spin dynamics.

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