Giant Reduction of Stabilized Pressure for the Superconducting Re0.8V0.2Se2 Phase

Access to new superconducting phases in transition-metal dichalcogenides (TMDs) via pressure treatment has been the primary target in this field. As equally essential as the fabrication of new superconducting materials at high pressure, maneuvering new superconducting phases at moderate pressures is also one of the core goals in the synthesis community. Here, we successfully reduced the synthesized pressure of the superconducting phase in ReSe₂ by combining V-doping and high-pressure techniques, with a reduction in pressure of 50% in contrast to ReSe₂. Our electrical transport measurements displayed that metallization appeared at 10 GPa and subsequently superconductivity appeared at about 52.4 GPa with T_c ∼ 1.9 K. There was a giant reduction in the stable pressure of the superconducting phase derived from the d-electrons and interlayer interaction changes, as evidenced by the Hall effect and X-ray diffraction measurements. These findings serve as ideal starting points and guidance for designing superconducting TMDs at moderate pressures.