Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity

Abstract

Recent STM experiments and theoretical considerations have highlighted the role of interaction-driven orbital selectivity in FeSe, and its role in generating the extremely anisotropic superconducting gap structure in this material. We study the magnetic excitation spectrum resulting from the coherent quasiparticles within the same renormalized random phase approximation approach used to explain the STM experiments, and show that it agrees well with the low-energy momentum and energy dependent response measured by inelastic neutron scattering experiments. We find a correlation-induced suppression of $(\pi ,\pi )$ scattering due to a small quasiparticle weight of states of $d_{xy}$ character. We compare predictions for twinned and untwinned crystals, and predict in particular a strongly $(\pi ,0)$-dominated response at low energies in untwinned systems, in contrast to previous itinerant theories.

arXiv comment14 pages, 11 figures, published version, tight binding model can be found at http://www.physik.uni-leipzig.de/~kreisel/tb_models/5band/FeSe_BQPI/model.php

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• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Anisotropic spin fluctuations in detwinned FeSe
• The Nematic Energy Scale and the Missing Electron Pocket in FeSe
• Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Iron-based superconductors: teenage, complex, challenging
• Theoretical study of impurity-induced magnetism in FeSe
• Singular magnetic anisotropy in the nematic phase of FeSe
• Synergy between Hund-driven correlations and boson-mediated Superconductivity
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• Orbital-dependent self-energy effects and consequences for the superconducting gap structure in multi-orbital correlated electron systems
• Raman response in the nematic phase of FeSe
• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
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• Frustrated magnetic interactions in FeSe
• Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
• Orbital-Selective High-Temperature Cooper Pairing Developed in the Two-Dimensional Limit
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe