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- Title
Collective Infrared Excitation in LuB<sub>12</sub> Cage-Glass.
- 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.
- 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.
- Subjects
INFRARED spectra; NUCLEAR excitation; DIELECTRIC properties; CONDUCTION bands; JAHN-Teller transitions; VIBRATION (Mechanics)
- Publication
JETP Letters, 2018, Vol 107, Issue 2, p100
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364018020029