Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Org.:
- Johns Hopkins Univ., Baltimore, MD (United States)
- OSTI Identifier:
- 1286724
- Alternate Identifier(s):
- OSTI ID: 1181408; OSTI ID: 1333649
- Grant/Contract Number:
- AC05-00OR22725; FG02-08ER46544
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 114; Journal Issue: 3; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
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., and Broholm, C. Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6. United States: N. p., 2015.
Web. doi:10.1103/PhysRevLett.114.036401.
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. Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6. United States. https://doi.org/10.1103/PhysRevLett.114.036401
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., and Broholm, C. Wed .
"Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6". United States. https://doi.org/10.1103/PhysRevLett.114.036401. https://www.osti.gov/servlets/purl/1286724.
@article{osti_1286724,
title = {Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6},
author = {Fuhrman, W. T. and Leiner, Jonathan C. and Nikolić, P. and Granroth, Garrett E. and Stone, Matthew B. and Lumsden, Mark D. and DeBeer-Schmitt, Lisa M. and Alekseev, Pavel A. and Mignot, Jean-Michel and Koohpayeh, S. M. and Cottingham, P. and Phelan, William Adam and Schoop, L. and McQueen, T. M. and Broholm, C.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.114.036401},
journal = {Physical Review Letters},
number = 3,
volume = 114,
place = {United States},
year = {Wed Jan 21 00:00:00 EST 2015},
month = {Wed Jan 21 00:00:00 EST 2015}
}
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