Abstract
Using angle-resolved photoemission spectroscopy (ARPES) and low-energy electron diffraction (LEED), together with density-functional theory (DFT) calculation, we report the formation of charge density wave (CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface (FS) exhibits parallel segments that can be well connected by the observed CDW ordering vector, indicating that the CDW order is driven by the electron-phonon coupling (EPC) as a result of the nested FS. The CDW gap is large (∼0.3 eV) and momentum-dependent, which naturally explains the robust CDW order up to high temperatures. The gap opening leads to a reduced density of states (DOS) near the Fermi level (EF), which correspondingly suppresses the many-body Kondo effect, leading to very localized 4f electrons at 20 K and above. The topological Dirac cone at the X point is found to remain gapless inside the CDW phase. Our results provide evidence for the competition between CDW and the Kondo effect in a Kondo lattice system. The robust CDW order in CeSbTe and related compounds provide an opportunity to search for the long-sought-after axionic insulator.
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This work was supported by the National Key R&D Program of the Ministry of Science and Technology of China (Grant Nos. 2016YFA0300203, and 2017YFA0303100), the National Science Foundation of China (Grant Nos. 11674280, and 11774305), and the Science Challenge Program of China. Part of this research used Beam line 03U of the Shanghai Synchrotron Radiation Facility, which was supported by ME2 Project (Grant No. 11227902) from the National Natural Science Foundation of China. We also acknowledge Elettra Sincrotrone Trieste for providing access to its synchrotron radiation facilities. Finally, we would like to thank Dr. Cheng-Maw Cheng, Dr. Pei-Yu Chuang, Dr. Zhengtai Liu, Dr. S. Gonzalez and Dr. G. Di Santo for help in the synchrotron ARPES measurements.
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Li, P., Lv, B., Fang, Y. et al. Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe. Sci. China Phys. Mech. Astron. 64, 237412 (2021). https://doi.org/10.1007/s11433-020-1642-2
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DOI: https://doi.org/10.1007/s11433-020-1642-2