Block magnetic excitations in the orbitally selective Mott insulator BaFe2Se3

Abstract

Iron pnictides and selenides display a variety of unusual magnetic phases originating from the interplay between electronic, orbital, and lattice degrees of freedom. Using powder inelastic neutron scattering on the two-leg ladder BaFe2Se3, we fully characterize the static and dynamic spin correlations associated with the Fe4 block state, an exotic magnetic ground state observed in this low-dimensional magnet and in Rb0.89Fe1.58Se2. All the magnetic excitations of the Fe4 block state predicted by an effective Heisenberg model with localized spins are observed below 300 meV and quantitatively reproduced. However, the data only account for 16 mub^2 per Fe2+, approximatively 2/3 of the total spectral weight expected for localized S=2 moments. Our results highlight how orbital degrees of freedom in iron-based magnets can conspire to stabilize an exotic magnetic state.

5 pages, 3 figures, 1 table

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Cited by in corpus (40)

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• Spin dynamics of the block orbital-selective Mott phase
• Novel Magnetic Block States in Low-Dimensional Iron-Based Superconductors
• Fingerprints of an Exotic Orbital-Selective Mott Phase in the Block Magnetic State of BaFe${}_2$Se${}_3$ Ladders
• First-principles study of magnetic properties in Fe-ladder compound BaFe2S3
• Flat Bands and Ferrimagnetic Order in Electronically Correlated Dice-Lattice Ribbons
• Spin waves and magnetic exchange interactions in the spin ladder compound RbFe${}_2$Se${}_3$
• Block-spiral magnetism: An exotic type of frustrated order
• Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators
• Iron telluride ladder compounds: Predicting the structural and magnetic properties of BaFe${}_2$Te${}_3$
• Gradual Enhancement of Stripe-Type Antiferromagnetism in Spin Ladder Material BaFe${}_2$S${}_3$ Under Pressure
• Magnetic states of iron-based two-leg ladder tellurides
• Magnetic states of quasi-one-dimensional iron chalcogenide Ba${}_2$FeS${}_3$
• Emergence of Superconductivity in Doped Multiorbital Hubbard Chains
• Polar State induced by Block-type Lattice Distortions in BaFe2Se3 with Quasi-One-Dimensional Ladder Structure
• Realization of the orbital-selective Mott state at the molecular level in Ba${}_3$LaRu${}_2$O${}_9$
• Block orbital-selective Mott insulators: a spin excitation analysis
• Robust block magnetism in the spin ladder compound BaFe${}_2$Se${}_3$ under hydrostatic pressure
• Prediction of exotic magnetic states in the alkali metal quasi-one-dimensional iron selenide compound Na${}_2$FeSe${}_2$
• 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
• Stability of the novel interorbital-hopping mechanism for ferromagnetism in multi-orbital Hubbard models
• Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux
• Microscopic description of insulator-metal transition in high-pressure oxygen
• Magnetic-order-driven metal-insulator transitions in the quasi-one-dimensional spin-ladder compounds BaFe${}_2$S${}_3$ and BaFe${}_2$Se${}_3$
• Structural, magnetic, and electronic evolution of the spin-ladder system BaFe${}_2$S${}_{3-x}$Se${}_x$ with isoelectronic substitution
• Hund bands in spectra of multiorbital systems
• Magnetism of BaFe2Se3 studied by Mössbauer spectroscopy
• Intertwined charge, spin, and pairing orders in doped iron ladders
• Spin interactions and magnetic order in the iron oxychalcogenides BaFe2Q2O
• Spin dynamics in NaFeAs and NaFe${}_{0.53}$Cu${}_{0.47}$As probed by resonant inelastic X-ray scattering
• Spin loop-current textures in Hubbard models
• Purely antiferromagnetic frustrated Heisenberg model in spin ladder compound BaFe${}_2$Se${}_3$
• Unconventional superconductivity induced by suppressing an iron-selenium based Mott insulator CsFe4-xSe4
• 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
• Multipole Orders in a Chain Ferrate Na2FeSe
• Quasi-one-dimensional spin excitations in the iron pnictide NaFe${}_{0.53}$Cu${}_{0.47}$As
• Coupled Hubbard ladders at weak coupling: Pairing and spin excitations