Pressure-Induced Electrical Transport Anomaly, Structure Evolution and Vibration Change in Layered Material 1T-TiTe2
doi: 10.11858/gywlxb.20180568
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摘要: 系统地研究了层状二碲化钛在压力（至43.4 GPa）作用下的电输运、晶格振动和结构性质。室温下样品的电阻率在6、13和22 GPa附近表现出一系列的异常。为更好地研究二碲化钛的电子结构，测试了样品的低温电阻，在约6 GPa处观察到超导转变。综合拉曼光谱和X射线衍射（XRD）实验结果发现：二碲化钛在6 GPa附近可能发生拓扑相变；继续加压至约13 GPa，样品发生从三角晶系到单斜晶系的结构相变，相变到22 GPa附近完全结束。XRD数据与电输运结果相互印证，揭示了样品在压力诱导下的结构演变和电子结构变化。因此，二碲化钛为人们了解过渡金属二硫化物提供了一个全新的视角。Abstract: We conducted a systematic study on pressure-dependent electrical, vibrational and structural properties of titanium ditelluride up to 43.4 GPa. The room-temperature resistivity shows a series of anomaly changes at around 6, 13 and 22 GPa. Low-temperature resistance measurement was also employed to better understand the electronic structure and we observed the superconductivity at about 6 GPa successfully. Raman spectroscopy and X-ray diffraction (XRD) experiment show a topological phase transition at about 6 GPa followed by a structure phase transition at about 13 GPa. The P3m1 to C2/m phase transition begins from about 13 GPa and completes at about 22 GPa. The XRD data correlate well with our electronic transport measurement result, which shows a pressure-induced structure evolution and electronic structure modification. Therefore titanium ditelluride may provide us with a new perspective to understand the high pressure behaviors in transition metal dichalcogenides.
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Figure 1. (a) XRD pattern of powder TiTe2 collected at ambient condition; (b) Trigonal P3m1 structure of TiTe2(Yellow and blue balls represent Ti and Te atom respectively.)
Figure 2. Room-temperature resistivity changes with pressure(The black dots and red circles are compression anddecompression data, respectively. Inset is thesetup of this measurement.)
Figure 3. (a) Resistance of TiTe2 between 2-300 K measured at various pressures; (b) Low-temperature regime of the resistivity of TiTe2 under high pressure up to 36.8 GPa
Figure 4. (a) Synchrotron XRD patterns of TiTe2 collected at various pressures up to 43.4 GPa; (b) Representative refinement of patterns collected at 1.0 GPa and (c) 22.4 GPa
Figure 5. Normalized lattice parameters a/a0, c/c0, V/V0 and c/a ratio of TiTe2 (A minimum ofthe ratio can be seen at around 6 GPa)
Figure 6. Room temperature resistivity, structural and superconductivity phase diagram of TiTe2 (The blue andred line represent Run 1 and Run 2 of superconductingphase respectively. The brown line shows the resistivityanomaly and superconductivity emergence at about 6 GPa.)
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