Block Magnetic Excitations in the Orbitally Selective Mott Insulator BaFe2Se3

Mourigal, M.; Wu, Shan; Stone, M. B.; Neilson, J. R.; Caron, J. M.; McQueen, T. M.; Broholm, C. L.

doi:10.1103/PhysRevLett.115.047401

Title: Block Magnetic Excitations in the Orbitally Selective Mott Insulator ${BaFe}_{2} {Se}_{3}$

Journal Article · Thu Jul 23 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.115.047401· OSTI ID:1528744

Mourigal, M. ^[1]; Wu, Shan ^[1]; Stone, M. B. ^[2]; Neilson, J. R. ^[3]; Caron, J. M. ^[3]; McQueen, T. M. ^[4]; Broholm, C. L. ^[5]

Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Dept. of Physics and Astronomy; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemistry
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Dept. of Physics and Astronomy; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemistry, and Dept. of Materials Science and Engineering
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering

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 $$BaFe_2Se_3$$, 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 Rb_0.89Fe_1.58Se₂. 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(3)$$μ^2_B$$ 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-08ER46544

OSTI ID:: 1528744

Alternate ID(s):: OSTI ID: 1201014

Journal Information:: Physical Review Letters, Vol. 115, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 52 works

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