期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 40, 页码 9859-9867出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c02492
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- Spanish Ministry of Science, Innovation and Universities [PID2019-106383GB-C41, RED2018-102612-T]
- Generalitat Valenciana [Prometeo/2018/123]
- Spanish Ministry of Science, Innovation, and Universities under the Ramon y Cajal fellowship [RYC2018-024947-I]
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
In TiSe2, the pressure-induced structural phase transition is closely linked to the superconducting transition, resulting in a series of phase transitions. The pressure affects the charge density wave and superconductivity significantly.
A pressure-induced structural phase transition and its intimate link with the superconducting transition was studied for the first time in TiSe 2 up to 40 GPa at room temperature using X-ray diffraction, transport measurement, and first-principles calculations. We demonstrate the occurrence of a first-order structural phase transition at 4 GPa from the standard trigonal structure (S.G.P (3) over bar m1) to another trigonal structure (S-G-P (3) over bar c1). Additionally, at 16 GPa, the P (3) over bar c1 phase spontaneously transforms into a monoclinic C2/m phase, and above 24 GPa, the C2/m phase returns to the initial P (3) over bar m1 phase. Electrical transport results show that metallization occurs above 6 GPa. The charge density wave observed at ambient pressure is suppressed upon compression up to 2 GPa with the emergence of superconductivity at 2.5 GPa, with a critical temperature (T-c) of 2 K. A structural transition accompanies the emergence of superconductivity that persists up to 4 GPa. The results demonstrate that the pressure-induced phase transitions explored by the experiments along with the theoretical predictions may open the door to a new path for searching and controlling the phase diagrams of transition metal dichalcogenides.
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