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

N E Sluchanko; A N Azarevich; A V Bogach; N B Bolotina; V V Glushkov; S V Demishev; A P Dudka; O N Khrykina; V B Filipov; N Yu Shitsevalova; G A Komandin; A V Muratov; Yu A Aleshchenko; E S Zhukova; B P Gorshunov

doi:10.1088/1361-648X/aaf44e

Observation of dynamic charge stripes in Tm_0.19Yb_0.81B₁₂ at the metal-insulator transition

J Phys Condens Matter. 2019 Feb 13;31(6):065604. doi: 10.1088/1361-648X/aaf44e. Epub 2018 Nov 27.

Authors

N E Sluchanko¹, A N Azarevich, A V Bogach, N B Bolotina, V V Glushkov, S V Demishev, A P Dudka, O N Khrykina, V B Filipov, N Yu Shitsevalova, G A Komandin, A V Muratov, Yu A Aleshchenko, E S Zhukova, B P Gorshunov

Affiliation

¹ Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, Moscow 119991, Russia. Moscow Institute of Physics and Technology, 9, Institutskii per., Dolgoprudnyi, Moscow region 141700, Russia.

PMID: 30524111
DOI: 10.1088/1361-648X/aaf44e

Abstract

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 Tm_0.19Yb_0.81B₁₂ 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 Tm_0.19Yb_0.81B₁₂. 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 [Formula: see text] directions through the variation of 5d-2p hybridization of electron states.