Evidence of Electronic Phase Separation in the Strongly Correlated Semiconductor YbB$_{12}$
A. Azarevich1, N. Bolotina2,1, O. Khrykina2, A. Bogach1, E. Zhukova3, B. Gorshunov3, A. Melentev3, Z. Bedran3, A. Alyabyeva3, M. Belyanchikov3, V. Voronov1, N. Yu. Shitsevalova4, V. B. Filipov4, and N. Sluchanko1*
1Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, Moscow 119991, Russia 2Shubnikov Institute of Crystallography, Federal Scientific Research Centre ‘Crystallography and Photonics’ of Russian Academy of Sciences, 59 Leninskiy Prospect, Moscow 119333, Russia 3Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (National Research University), 141700 Dolgoprudny, Moscow Region, Russia 4Institute for Problems of Materials Science, NASU, Krzhizhanovsky Str. 3, 03142 Kyiv, Ukraine
Abstract：We investigate high-quality single-domain crystals of YbB$_{12}$ using the precise x-ray diffraction technique in combination with the low-temperature polarized THz–infrared spectroscopy and accurate magnetotransport measurements. It is shown for the first time that this archetypal strongly correlated system with a metal-insulator transition to a mysterious dielectric ground state with a metal Fermi surface [Science362, 65 (2018) and ibid362, 32 (2018)] is actually a heterogeneous compound in the regime of electronic phase separation. Changes in the configuration of the discovered dynamic charge stripes are proposed upon cooling. As a result, a conclusion is drawn in favor of a crossover between different patterns of the filamentary electronic structure penetrating the semiconducting matrix of YbB$_{12}$. We argue that the discovery of stripes in YbB$_{12}$ is fundamental, elucidating the nature of exotic dielectric state in Kondo insulators.
(Strongly correlated electron systems; heavy fermions)
引用本文:
. [J]. 中国物理快报, 2022, 39(12): 127302-.
A. Azarevich, N. Bolotina, O. Khrykina, A. Bogach, E. Zhukova, B. Gorshunov, A. Melentev, Z. Bedran, A. Alyabyeva, M. Belyanchikov, V. Voronov, N. Yu. Shitsevalova, V. B. Filipov, and N. Sluchanko. Evidence of Electronic Phase Separation in the Strongly Correlated Semiconductor YbB$_{12}$. Chin. Phys. Lett., 2022, 39(12): 127302-.
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Supplementary Information: The experimental details of terahertz-infrared and Hall effect measurements; XRD data analysis in YbB$_{12}$; the gap values detected previously for YbB$_{12}$ and Tm$_{1-x}$Yb$_{x}$B$_{12}$.
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