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Singlet-triplet Hamiltonian for spin excitations in a Kondo insulator

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Abstract

In the nonsymmetric version of the periodic Anderson model for a Kondo insulator, an effective singlet-triplet Hamiltonian Ĥ s−t with indirect antiferromagnetic f-f exchange is constructed, which makes it possible to analyze the dynamic magnetic susceptibility χ f (k, ω) of f electrons. Hamiltonian Ĥ s−t is used to describe the experimentally observed dispersion of the three-level spin excitation spectrum in YbB12. A distinguishing feature of this analysis is the introduction of small-radius singlet and triplet collective f-d excitations that form low- and high-lying spin bands during motion over the lattice.

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Authors and Affiliations

  1. Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow oblast, 142190, Russia

    A. F. Barabanov

  2. Moscow Institute of Physics and Technology, Dolgoprudnyi, Moscow oblast, 141700, Russia

    A. F. Barabanov & L. A. Maksimov

  3. Kurchatov Institute, Russian Research Center, Moscow, 123182, Russia

    L. A. Maksimov

Authors
  1. A. F. Barabanov
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  2. L. A. Maksimov
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Correspondence to A. F. Barabanov.

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Original Russian Text © A.F. Barabanov, L.A. Maksimov, 2010, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 138, No. 2, pp. 282–288.

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Barabanov, A.F., Maksimov, L.A. Singlet-triplet Hamiltonian for spin excitations in a Kondo insulator. J. Exp. Theor. Phys. 111, 251–257 (2010). https://doi.org/10.1134/S1063776110080169

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  • DOI: https://doi.org/10.1134/S1063776110080169

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