Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6

Fuhrman, W. T.; Leiner, Jonathan C.; Nikolić, P.; Granroth, Garrett E.; Stone, Matthew B.; Lumsden, Mark D.; DeBeer-Schmitt, Lisa M.; Alekseev, Pavel A.; Mignot, Jean-Michel; Koohpayeh, S. M.; Cottingham, P.; Phelan, William Adam; Schoop, L.; McQueen, T. M.; Broholm, C.

doi:10.1103/PhysRevLett.114.036401

Title: Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB₆

Journal Article · Wed Jan 21 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.036401· OSTI ID:1286724

Fuhrman, W. T. ^[1]; Leiner, Jonathan C. ^[2]; Nikolić, P. ^[3]; Granroth, Garrett E. ^[4]; Stone, Matthew B. ^[2]; Lumsden, Mark D. ^[2]; DeBeer-Schmitt, Lisa M. ^[5]; Alekseev, Pavel A. ^[6]; Mignot, Jean-Michel ^[7]; Koohpayeh, S. M. ^[1]; Cottingham, P. ^[8]; Phelan, William Adam ^[8]; Schoop, L. ^[9]; McQueen, T. M. ^[10]; Broholm, C. ^[11]

Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. 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. Dept. of Physics and Astronomy; George Mason Univ., Fairfax, VA (United States). School of Physics, Astronomy and Computational Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument Source Division
National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI); National Research Nuclear Univ. MEPhI, Moscow (Russian Federation)
CEA Saclay, Gif sur Yvette (France). CEA-CNRS. Lab. Leon Brillouin
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. 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. Dept. of Physics and Astronomy; Princeton Univ., NJ (United States). Dept. of Chemistry
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemistry; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. 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

Using inelastic neutron scattering, we map a 14 meV coherent resonant mode in the topological Kondo insulator SmB₆ and describe its relation to the low energy insulating band structure. The resonant intensity is confined to the X and R high symmetry points, repeating outside the first Brillouin zone and dispersing less than 2 meV, with a 5d-like magnetic form factor. We present a slave-boson treatment of the Anderson Hamiltonian with a third neighbor dominated hybridized band structure. This approach produces a spin exciton below the charge gap with features that are consistent with the observed neutron scattering. As a result, we find that maxima in the wave vector dependence of the inelastic neutron scattering indicate band inversion.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

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

Contributing Organization:: Johns Hopkins Univ., Baltimore, MD (United States)

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

OSTI ID:: 1286724

Alternate ID(s):: OSTI ID: 1181408; OSTI ID: 1333649

Journal Information:: Physical Review Letters, Vol. 114, Issue 3; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 71 works

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Additional energy scale in SmB6 at low-temperature Jiao, L.; Rößler, S.; Kim, D. J. Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms13762	journal	December 2016
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Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB6 Hartstein, M.; Toews, W. H.; Hsu, Y. -T. Nature Physics, Vol. 14, Issue 2 https://doi.org/10.1038/nphys4295	journal	October 2017
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Unconventional thermal metallic state of charge-neutral fermions in an insulator Sato, Y.; Xiang, Z.; Kasahara, Y. Nature Physics, Vol. 15, Issue 9 https://doi.org/10.1038/s41567-019-0552-2	journal	July 2019
Breakdown of the strong multiplet description of the Sm2+ ion in the topological Kondo insulator SmB6: specific heat studies Radwanski, Ryszard J.; Nalecz, Dawid M.; Ropka, Zofia Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-47776-3	journal	August 2019
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