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Collective Infrared Excitation in LuB12 Cage-Glass

  • Optics and Laser Physics
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Abstract

By measuring room temperature infrared (40–35000 cm–1) reflectivity of metallic LuB12 single crystals with different isotopic compositions (natB, 10B, 11B), we find that to model the spectrum we had to introduce, additionally to Drude free-carrier component, a broad excitation with unusually large dielectric contribution (Δε = 8000 ± 4000), which is characterized by a non-Lorentzian lineshape. It is suggested that the origin of the excitation is connected with cooperative dynamics of Jahn–Teller active B12 molecules producing quasilocal vibrations (rattling modes) of caged lutetium ions. The coupling of the Lu3+ rattling motions with the charge carriers of conduction band is proposed to be the reason of strongly damped character of the excitation.

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Authors and Affiliations

  1. Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow region, 141700, Russia

    B. P. Gorshunov, E. S. Zhukova, S. V. Demishev & N. E. Sluchanko

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

    B. P. Gorshunov, G. A. Komandin, S. V. Demishev & N. E. Sluchanko

  3. Faculty of Physics, Southern Federal University, Rostov-on-Don, 344090, Russia

    V. I. Torgashev

  4. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    A. V. Muratov & Yu. A. Aleshchenko

  5. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev, 03680, Ukraine

    N. Yu. Shitsevalova & V. B. Filipov

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  1. B. P. Gorshunov
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  2. E. S. Zhukova
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  3. G. A. Komandin
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  4. V. I. Torgashev
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  5. A. V. Muratov
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  6. Yu. A. Aleshchenko
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  7. S. V. Demishev
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  8. N. Yu. Shitsevalova
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  9. V. B. Filipov
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  10. N. E. Sluchanko
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Correspondence to B. P. Gorshunov.

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Gorshunov, B.P., Zhukova, E.S., Komandin, G.A. et al. Collective Infrared Excitation in LuB12 Cage-Glass. Jetp Lett. 107, 100–105 (2018). https://doi.org/10.1134/S0021364018020029

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  • DOI: https://doi.org/10.1134/S0021364018020029

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