Analysis of the superconducting properties of transition metal dichalcogenides (TMDs) under high pressures offers valuable insights to guide the design and synthesis of high-performance superconducting materials. Herein, the effect of pressure is investigated on the superconductivity of a typical van der Waals layered TMDs material, PdSSe, by measuring its transport properties. After initially increased pressure, superconductivity emerges at 10.2 GPa, with a critical superconducting temperature (T_c) of ≈5.1 K, accompanied by the diminishing charge density wave (CDW) that is originally strengthening. Then, the T_c gradually increases with increasing pressure, reaching 12.1 K at the maximum pressure. The study provides experimental evidence for the superconductivity of PdSSe, and to the best of the knowledge, this is the first report on the observation of amplified CDW phenomena under increasing pressure in nonmagnetic TMDs. The abnormal enhancement of CDW transition temperature at low pressure is consistent with the upward trend of resistance, which is related to the electron–electron interaction. Moreover, synchrotron X-ray diffraction experiments reveal two additional structural phase transitions.

中文翻译：

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高压 PdSSe 超导性的实验研究

高压下过渡金属二硫属化物（TMD）的超导性能分析为指导高性能超导材料的设计和合成提供了宝贵的见解。在此，通过测量其输运特性，研究了压力对典型范德华层状 TMD 材料 PdSSe 超导性的影响。最初增加压力后，在 10.2 GPa 时出现超导，临界超导温度 ( T _c ) 约为 5.1 K，并伴随着最初增强的递减电荷密度波 (CDW)。然后，T _c随着压力的增加而逐渐增加，在最大压力时达到12.1 K。该研究为 PdSSe 的超导性提供了实验证据，据所知，这是第一份关于在非磁性 TMD 中观察到压力增加下放大 CDW 现象的报告。低压下CDW转变温度的异常升高与电阻的上升趋势一致，这与电子-电子相互作用有关。此外，同步加速器X射线衍射实验揭示了两个额外的结构相变。