Collective Infrared Excitation in LuB12 Cage-Glass

By measuring room temperature infrared (40–35000 cm –1 ) reflectivity of metallic LuB12 single crystals with different isotopic compositions ( nat B, 10 B, 11 B), we find that to model the spectrum we had to introduce, additionally to Drude free-carrier component, a broad excitation with unusually l...

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Bibliographic Details
Published in:JETP letters 2018, Vol.107 (2), p.100-105
Main Authors: Gorshunov, B. P., Zhukova, E. S., Komandin, G. A., Torgashev, V. I., Muratov, A. V., Aleshchenko, Yu. A., Demishev, S. V., Shitsevalova, N. Yu, Filipov, V. B., Sluchanko, N. E.
Format: Article
Language:English
Subjects:
Atomic
Biological and Medical Physics
Biophysics
Conduction bands
Coupling (molecular)
Crystals
Current carriers
Excitation
Isotopes
Lutetium
Lutetium compounds
Molecular
Optical and Plasma Physics
Optics and Laser Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Single crystals
Solid State Physics
Spintronics
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Summary:By measuring room temperature infrared (40–35000 cm –1 ) reflectivity of metallic LuB12 single crystals with different isotopic compositions ( nat B, 10 B, 11 B), 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 B 12 molecules producing quasilocal vibrations (rattling modes) of caged lutetium ions. The coupling of the Lu 3+ rattling motions with the charge carriers of conduction band is proposed to be the reason of strongly damped character of the excitation.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364018020029