Pressure-Induced Re-Emergence of Two-Dimensional Superconductivity in (PbS) 1.13 TaS 2

Two-dimensional (2D) superconductivity provides a broad platform for investigating superconducting pairing and various exotic quantum states in the 2D limit. However, despite being a powerful tool to tune and enhance superconducting properties in 2D materials, applied pressure often inevitably disrupts the delicate 2D superconductivity due to its strong influence on material structure and electronic states. Here, we adopted a feasible strategy to decouple the superconducting TaS2 layers in (PbS)1.13TaS2 by introducing nonsuperconducting PbS layers and found a reemergence of 2D superconductivity under high pressure. At low pressure, the PbS layers act as efficient spacers to induce the intrinsic 2D superconducting state (SC-I) in (PbS)1.13TaS2, which is progressively suppressed upon pressure application due to the enhanced pair-breaking effect. When the pressure is further raised to ∼61 GPa, a new high-pressure superconducting state (SC-II) emerged, accompanied by a Lifshitz transition. More importantly, the analyses of the Berezinskii–Kosterlitz–Thouless (BKT) transition behavior and the angle-resolved critical field demonstrate that the SC-II phase retains a distinctly 2D character, with its Tc further enhanced under pressure to 7.1 K. Our findings offer a novel experimental strategy for engineering 2D superconductivity and serve as a platform to explore exotic quantum phenomena under extreme conditions.