Pressure-induced reentrant superconductivity in a misfit layered compound $\mathrm{(SnS)_{1.15}(TaS_2)}$

TL;DR

This study reveals that applying high pressure to a misfit layered compound induces a reentrant superconducting phase after initial suppression, driven by electronic reconstruction without structural change.

Contribution

It demonstrates pressure as a tool to engineer superconductivity and electronic states in misfit layered van der Waals heterostructures, showing reentrant behavior.

Findings

Superconductivity is suppressed near 14.7 GPa and reemerges above 80 GPa.

Reentrant superconductivity correlates with a sign reversal of the Hall coefficient.

No structural phase transition occurs across the entire pressure range.

Abstract

Misfit layered compounds are natural van der Waals heterostructures in which electronically active transition-metal dichalcogenide layers are decoupled by incommensurate blocking layers, enabling bulk realization of quasi-two-dimensional quantum states. Here we investigate the superconducting, transport,and structural properties of the misfit compound $\mathrm{(SnS)_{1.15}(TaS_2)}$ under pressures up to 150 GPa. The low-pressure superconducting phase is gradually suppressed and disappears near 14.7 GPa,accompanied by increasing residual resistance. Remarkably, a distinct superconducting phase reemerges above 80 GPa and persists to the highest pressures achieved. This reentrant superconductivity follows a pressure-induced sign reversal of the Hall coefficient near 60 GPa and a nonmonotonic evolution of the normal-state resistance, indicating an electronic reconstruction. No structural phase transition is detected over the entire pressure range. Our results demonstrate a pressure-driven electronic reconstruction leading to reentrant superconductivity in a misfit layered compound, establishing pressure as an effective route to engineer superconductivity and electronic states in natural van der Waals heterostructures.