The quasi-one-dimensional topological insulator ${\mathrm{TaSe}}_3$ offers an intriguing platform to study the intertwined exotic quantum order, such as superconductivity and charge-density-wave (CDW) order, and nontrivial topological states. Nevertheless, it remains unclear how robust the superconductivity in this quasi-one-dimensional material is and how close the (hidden) CDW exists in its phase diagram. In this work, we unveil a well-defined CDW transition in ${\mathrm{TaSe}}_3$ crystals by leveraging a hydrostatic pressure. Remarkably, it is found that the CDW transition temperature gradually strengthens as the pressure increases, and crosses the room temperature above $\sim 2\mathrm{GPa}$, which makes it promising in future applications in electronic devices. Furthermore, based on the pressure-dependent resistivity and Raman spectroscopy measurements by using a diamond anvil cell, we have extended the high-pressure study up to 50 GPa and verified a proposed phase transition around 6–10 GPa. However, no superconductivity is observed down to 2 K in the whole pressure range studied, suggesting the superconductivity is fragile in this quasi-one-dimensional transition-metal trichalcogenide.

中文翻译：

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准一维拓扑绝缘体 TaSe3 中压力诱导的电荷密度波


准一维拓扑绝缘体 ${\mathrm{TaSe}}_3$ 提供了一个有趣的平台来研究相互交织的奇异量子序，例如超导性和电荷密度波（CDW）序以及非平凡的拓扑态。然而，目前尚不清楚这种准一维材料的超导性有多鲁棒，以及其相图中（隐藏的）CDW 的存在程度如何。在这项工作中，我们揭示了一个定义明确的 CDW 转换 ${\mathrm{TaSe}}_3$ 利用静水压力来形成晶体。值得注意的是，我们发现CDW转变温度随着压力的增加而逐渐增强，并在高于室温时穿过 $\sim 2\mathrm{GPa}$ ，这使得它在未来的电子设备应用中充满希望。此外，基于使用金刚石砧池进行的压力相关电阻率和拉曼光谱测量，我们将高压研究扩展到了 50 GPa，并验证了建议的 6-10 GPa 左右的相变。然而，在整个研究的压力范围内没有观察到低至 2 K 的超导性，这表明这种准一维过渡金属三硫属化物的超导性很脆弱。