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Sluchanko, N E; Azarevich, A N; Bogach, A V; Bolotina, N B; Glushkov, V V; Demishev, S V; Dudka, A P; Khrykina, O N; Filipov, V B; Shitsevalova, N Yu; Komandin, G A; Muratov, A V; Aleshchenko, Yu A; Zhukova, E S; Gorshunov, B P
Journal of physics. Condensed matter, 02/2019, Volume: 31, Issue: 6Journal Article
Accurate low temperature charge transport measurements in combination with high-precision x-ray diffraction experiments have allowed detection of the symmetry lowering in the single domain Tm0.19Yb0.81B12 crystals that belong to the family of dodecaborides with metal-insulator transition. Based on the fine structure analysis we discover the formation of dynamic charge stripes within the semiconducting matrix of Tm0.19Yb0.81B12. The charge dynamics in these conducting nano-size channels is characterized by broad-band optical spectroscopy that allowed estimating the frequency (~2.4 × 1011 Hz) of quantum motion of the charge carriers. It is suggested that cooperative Jahn-Teller effect in the boron sublattice is a cause of the large-amplitude rattling modes of the Tm and Yb ions responsible for the 'modulation' of the conduction band along one of the directions through the variation of 5d-2p hybridization of electron states.
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