Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB<sub>6</sub> [electronic resource]
In this paper, using inelastic neutron scattering, we map a 14 meV coherent resonant mode in the topological Kondo insulator SmB<sub>6</sub> and describe its relation to the low energy insulating band structure. The resonant intensity is confined to the X and R high symmetry points, repe...
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Online Access (via OSTI) |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Basic Energy Sciences ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2015.
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| Summary: | In this paper, using inelastic neutron scattering, we map a 14 meV coherent resonant mode in the topological Kondo insulator SmB<sub>6</sub> 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. Finally, we find that maxima in the wave vector dependence of the inelastic neutron scattering indicate band inversion. |
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| Item Description: | Published through SciTech Connect. 01/21/2015. "KC0402010" "ERKCSNX" Physical Review Letters 114 3 ISSN 0031-9007 AM. W. T. Fuhrman; Jonathan C. Leiner; P. Nikolić; Garrett E. Granroth; Matthew B. Stone; Mark D. Lumsden; Lisa M. DeBeer-Schmitt; Pavel A. Alekseev; Jean-Michel Mignot; S. M. Koohpayeh; P. Cottingham; William Adam Phelan; L. Schoop; T. M. McQueen; C. Broholm. |
| Physical Description: | Article No. 036401 : digital, PDF file. |