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Collective and Quasi-Local Modes in the Optical Spectra of YB6 and YbB6 Hexaborides with Jahn–Teller Structural Instability

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Abstract

The broad-band reflection spectra of YB6 and YbB6 hexaborides with Jahn–Teller instability of the boron cage have been measured at room temperature. An optical conductivity analysis has revealed, along with the Drude electronic components, heavily overdamped collective modes, which are notable in YB6 for high dielectric contributions, Δε = 2000–5700. The fraction of nonequilibrium charge carriers in YB6, which is at the boundary of structural instability in the hexaboride family, reaches 85–90%, whereas this fraction in doped YbB6 semiconductor is not higher than 25%. It has been shown that unlike the predictions of the topological Kondo insulator model, the surface “metallization” in Yb2+B6 crystals can be explained by additional doping of a surface layer with Yb3+ ions.

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ACKNOWLEDGMENTS

The authors thank V.V. Glushkov for valuable discussions.

Funding

Experiments were conducted using equipment of Shared Facility Center for Studies of HTSC and Other Strongly Correlated Materials, Lebedev Physical Institute, Russian Academy of Sciences, with support from the Ministry of Science and Higher Education of the Russian Federation (project no. FSMG-2021-0005).

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Authors and Affiliations

  1. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    N. E. Sluchanko, A. N. Azarevich & M. A. Anisimov

  2. Center for Photonics and Two-Dimensional Materials, Moscow Institute of Physics and Technology (National Research University), 141700, Dolgoprudny, Moscow oblast, Russia

    E. S. Zhukova, L. N. Alyabyeva & B. P. Gorshunov

  3. Lebedev Physics Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    A. V. Muratov & Yu. A. Aleshchenko

  4. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 03142, Kiev, Ukraine

    N. Yu. Shitsevalova, S. E. Polovets & V. B. Filipov

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  1. N. E. Sluchanko
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  2. E. S. Zhukova
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  3. L. N. Alyabyeva
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  4. B. P. Gorshunov
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  6. Yu. A. Aleshchenko
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  7. A. N. Azarevich
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  8. M. A. Anisimov
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  9. N. Yu. Shitsevalova
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  10. S. E. Polovets
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  11. V. B. Filipov
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Correspondence to N. E. Sluchanko.

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Translated by V. Isaakyan

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Sluchanko, N.E., Zhukova, E.S., Alyabyeva, L.N. et al. Collective and Quasi-Local Modes in the Optical Spectra of YB6 and YbB6 Hexaborides with Jahn–Teller Structural Instability. J. Exp. Theor. Phys. 136, 148–154 (2023). https://doi.org/10.1134/S1063776123020061

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  • DOI: https://doi.org/10.1134/S1063776123020061

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