Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS2 single crystal
Qing Hu(胡庆)1, Cong Yin(尹聪)1, Leilei Zhang(张雷雷)2, Li Lei(雷力)2, Zhengshang Wang(王正上)1, Zhiyu Chen(陈志禹)1, Jun Tang(唐军)1,3, Ran Ang(昂然)1,3
1 Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2 Key Laboratory of High Energy Density Physics and Technology, Ministry of Education, Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
3 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
The evolution of electron correlation and charge density wave (CDW) in 1T-TaS2 single crystal has been investigated by temperature-dependent Raman scattering, which undergoes two obvious peaks of A1g modes about 70.8 cm-1 and 78.7 cm-1 at 80 K, respectively. The former peak at 70.8 cm-1 is accordant with the lower Hubbard band, resulting in the electron-correlation-driven Mott transition. Strikingly, the latter peak at 78.7 cm-1 shifts toward low energy with increasing the temperature, demonstrating the occurrence of nearly commensurate CDW phase (melted Mott phase). In this case, phonon transmission could be strongly coupled to commensurate CDW lattice via Coulomb interaction, which likely induces appearance of hexagonal domains suspended in an interdomain phase, composing the melted Mott phase characterized by a shallow electron pocket. Combining electronic structure, atomic structure, transport properties with Raman scattering, these findings provide a novel dimension in understanding the relationship between electronic correlation, charge order, and phonon dynamics.
Project supported by the National Natural Science Foundation of China (Grant Nos. 51771126 and 11774247), the Youth Foundation of Science and Technology Department of Sichuan Province, China (Grant No. 2016JQ0051), and the World First-Class University Construction Funding.
Corresponding Authors:
Ran Ang, Li Lei
E-mail: rang@scu.edu.cn;lei@scu.edu.cn
Cite this article:
Qing Hu(胡庆), Cong Yin(尹聪), Leilei Zhang(张雷雷), Li Lei(雷力), Zhengshang Wang(王正上), Zhiyu Chen(陈志禹), Jun Tang(唐军), Ran Ang(昂然) Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS2 single crystal 2018 Chin. Phys. B 27 017104
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