Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS<sub>2</sub> single crystal<xref rid="cpb_27_1_017104fn1" ref-type="fn">*</xref> <fn id="cpb_27_1_017104fn1"> <label>*</label> <p>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.</p> </fn>

Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS₂ single crystal* *

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.

Hu Qing¹, Yin Cong¹, Zhang Leilei², Lei Li^{2, ‡}, Wang Zhengshang¹, Chen Zhiyu¹, Tang Jun^{1, 3}, Ang Ran^{1, 3, †}

(color online) (a) Two main types of crystal lattice Raman-active vibration A_1g and E_g modes in 1T-TaS₂. (b) Temperature-dependent Raman spectra in the cooling cycle from 300 to 80 K. (c) Temperature-dependent Raman spectra focused on the temperature range from 190 to 80 K. (d) All of fitting peaks derived from Raman spectra at 80 K. (e), (f) Shift of Raman peaks of and as a function of temperature, respectively. Evolution of superstructure illustrated from CCDW to NCCDW phase based on Raman spectra.