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Higher accuracy low temperature charge transport measurements in combinationwith precise X-ray diffraction experiment have allowed detecting the symmetrylowering in the single domain Tm0.19Yb0.81B12 crystals of the family ofdodecaborides with metal-insulator transition. Basing on the fine structureanalysis we discover formation of dynamic charge stripes within thesemiconducting matrix of Tm0.19Yb0.81B12. The charge dynamics in these metallicnano-size conducting channels is characterized by broad-band opticalspectroscopy that allowed estimating the frequency (~2.4 10^11 Hz) of quantummotion of the charge carriers. It is suggested that caused by cooperativeJahn-Teller effect in the boron sub-lattice, the large amplitude rattling modesof the Tm and Yb ions are responsible for modulation of the conduction bandalong [110] direction through the variation of 5d-2p hybridization of electronstates.

Observation of dynamic charge stripes in Tm0.19Yb0.81B12 at the metal-insulator transition