Pressure tuning of the charge density wave and superconductivity in the noncentrosymmetric superconductor 4Ha−TaSe2
Zhihan Si, Shaopeng Wang, Yonghui Zhou, Junxiang Yuan, Ranran Zhang, Shuyang Wang, Chao An, Yuzhou Bao, Xuliang Chen, Ying Zhou, Min Zhang, Lili Zhang, Xiaoping Yang, Zhaorong Yang
DOI 10.1103/pbgh-693x · Physical Review B
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Abstract
Here, we report the structure-property relationship in pressurized 4Ha−TaSe2 single crystals. Electrical transport and low-temperature Raman spectroscopy measurements indicate a charge density wave (CDW) transition at TCDW∼120 K under ambient pressure. High-pressure transport experiments reveal a competitive relationship between superconductivity (SC) and CDW in 4Ha−TaSe2. Under compression, the CDW order is progressively suppressed and vanishes abruptly at a critical pressure Pc of ∼19 GPa. In contrast, the superconducting transition temperature is gradually enhanced from Tc∼3.1 K at ambient pressure to an optimal Tc∼7.8 K at Pc, followed by a slow reduction up to 83.7 GPa. Synchrotron x-ray diffraction experiments show that the pristine hexagonal structure remains stable under pressure, while the dimensionality transforms from quasi-2D to quasi-3D near Pc. Simultaneously, Raman vibrational modes exhibit significant anomalies around Pc, including changes in Raman intensity and pressure coefficients of normal in-plane modes, as well as in a two-phonon mode. Thus, the collapse of the CDW near Pc and the domelike superconducting phase diagram could be related to a dimensional crossover in the crystal structure. These findings not only establish the pressure-temperature phase diagram of 4Ha−TaSe2 polytype but also facilitate the systematic understanding of the interplay between SC and CDW across the transition-metal dichalcogenides family of materials.
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