Spin dynamics of the block orbital-selective Mott phase

Abstract

Iron-based superconductors display a variety of magnetic phases originating in the competition between electronic, orbital, and spin degrees of freedom. Previous theoretical investigations of the multi-orbital Hubbard model in one dimension revealed the existence of an orbital-selective Mott phase (OSMP) with block spin order. Recent inelastic neutron scattering (INS) experiments on the BaFe${}_2$Se${}_3$ ladder compound confirmed the relevance of the block-OSMP. Moreover, the powder INS spectrum reveled an unexpected structure, containing both low-energy acoustic and high-energy optical modes. Here we present the theoretical prediction for the dynamical spin structure factor within a block-OSMP regime using the density-matrix renormalization group method. In agreement with experiments we find two dominant features: low-energy dispersive and high-energy dispersionless modes. We argue that the former represents the spin-wave-like dynamics of the block ferromagnetic islands, while the latter is attributed to a novel type of local on-site spin excitations controlled by the Hund coupling.

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Cited by in corpus (30)

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• Novel Magnetic Block States in Low-Dimensional Iron-Based Superconductors
• Flat Bands and Ferrimagnetic Order in Electronically Correlated Dice-Lattice Ribbons
• Block-spiral magnetism: An exotic type of frustrated order
• Cross-band versus intra-band pairing in superconductors: signatures and consequences of the interplay
• Iron telluride ladder compounds: Predicting the structural and magnetic properties of BaFe${}_2$Te${}_3$
• Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators
• Magnetic states of iron-based two-leg ladder tellurides
• Magnetic states of quasi-one-dimensional iron chalcogenide Ba${}_2$FeS${}_3$
• Realization of the orbital-selective Mott state at the molecular level in Ba${}_3$LaRu${}_2$O${}_9$
• Emergence of Superconductivity in Doped Multiorbital Hubbard Chains
• Block orbital-selective Mott insulators: a spin excitation analysis
• Prediction of exotic magnetic states in the alkali metal quasi-one-dimensional iron selenide compound Na${}_2$FeSe${}_2$
• Robust block magnetism in the spin ladder compound BaFe${}_2$Se${}_3$ under hydrostatic pressure
• Prediction of orbital selective Mott phases and block magnetic states in the quasi-one-dimensional iron chain Ce${}_2$O${}_2$FeSe${}_2$ under hole and electron doping
• Orbital-selective Mott phase and non-Fermi liquid in FePS${}_3$
• Interplay of finite-energy and finite-momentum superconducting pairing
• BCS-BEC crossover in a $(t_{2g}{)}^4$ Excitonic Magnet
• Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux
• Quantum Transitions of Nematic Phases in a Spin-$1$ Bilinear-Biquadratic Model and Their Implications for FeSe
• Magnetic-order-driven metal-insulator transitions in the quasi-one-dimensional spin-ladder compounds BaFe${}_2$S${}_3$ and BaFe${}_2$Se${}_3$
• Hund bands in spectra of multiorbital systems
• Intertwined charge, spin, and pairing orders in doped iron ladders
• Novel Block Excitonic Condensate at $n=3.5$ in a Spin-Orbit Coupled $t_{2g}$ Multiorbital Hubbard Model
• Kanamori-Moiré-Hubbard model for transition metal dichalcogenide homobilayers
• Purely antiferromagnetic frustrated Heisenberg model in spin ladder compound BaFe${}_2$Se${}_3$
• Magnon damping and mode softening in quantum double-exchange ferromagnets
• Intertwined charge, spin, and orbital degrees of freedom under electronic correlations in the one-dimensional Fe${}^{3+}$ chalcogenide chain
• Quasi-one-dimensional spin excitations in the iron pnictide NaFe${}_{0.53}$Cu${}_{0.47}$As
• Eliminating Orbital Selectivity from the Metal-Insulator Transition by Strong Magnetic Fluctuations