Hidden Charge Order and Multiple Electronic Instabilities in EuTe4

Xiao, K.; Dong, W.-H.; Wang, X.; Yu, J.; Fu, D.; Hu, Z.; Guo, Y.; Zhang, Q.; Hou, X.; Guo, Y.; Yang, L.; Xu, Y.; Tang, P.; Duan, W.; Xue, Q.; Li, W.

doi:10.1021/acs.nanolett.4c01588

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Hidden Charge Order and Multiple Electronic Instabilities in EuTe4

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Tang, P.
School of Materials Science and Engineering, Beihang University;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;

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https://doi.org/10.1021/acs.nanolett.4c01588
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nl4c01588_si_001.pdf
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Citation

Xiao, K., Dong, W.-H., Wang, X., Yu, J., Fu, D., Hu, Z., et al. (2024). Hidden Charge Order and Multiple Electronic Instabilities in EuTe4. Nano Letters, 24(25), 7681-7687. doi:10.1021/acs.nanolett.4c01588.

Cite as: https://hdl.handle.net/21.11116/0000-000F-6F95-D

Abstract

The rare-earth telluride compound EuTe₄ exhibits a charge density wave (CDW) and an unconventional thermal hysteresis transition. Herein, we report a comprehensive study of the CDW states in EuTe₄ by using low-temperature scanning tunneling microscopy. Two types of charge orders are observed at 4 K, including a newly discovered spindle-shaped pattern and a typical stripe-like pattern. As an exotic charge order, the spindle-shaped CDW is off-axis and barely visible at 77 K, indicating that it is a hidden order developed at low temperature. Based on our first-principles calculations, we reveal the origins of the observed electronic instabilities. The spindle-shaped charge order stems from a subsequent transition based on the stripe-like CDW phase. Our work demonstrates that the competition and cooperation between multiple charge orders can generate exotic quantum phases.