Experimental Investigation of Superconductivity in PdSSe Under High Pressure

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 (Tc) of approximate to 5.1 K, accompanied by the diminishing charge density wave (CDW) that is originally strengthening. Then, the Tc 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. This paper presents the synthesis of PdSSe with CDW utilizing high-temperature and high-pressure methods and highlights its superconducting properties at high pressures. Remarkably, the CDW strengthens as the pressure increases in the low-pressure range. Notably, superconductivity emerges at 10.2 GPa and a critical temperature of approximate to 5.1 K, accompanied by diminishing charge density wave. image