Interplay of structure and superconductivity in α-SnS tuned by pressure
Xindeng Lv, Simin Li, Yanping Huang, Tian Cui
DOI 10.1103/PhysRevB.110.054107 · Physical Review B
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Abstract
The emergent structure under high pressure introduces a distinctive lattice arrangement, deviating from conventional configurations and offering a unique landscape for exploring intriguing properties, especially in the domain of superconductivity. Here, we have systematically investigated the structural evolution and electrical properties of α-SnS under high pressure. The x-ray diffraction results indicate that SnS undergoes two phase transitions at 16.8 and 49.7 GPa, representing a second-order Pnma to Cmcm transition and a first-order Cmcm to Pm3¯m transition. In addition, single-crystal in situ high-pressure Raman spectroscopy experiments have confirmed it. Electrical transport measurements demonstrate the transition of SnS from a semiconductor to a metal and then to a superconductor under high pressure, intricately linked to a structural transition and an increase in the hole carrier concentration. Combined with our first principles calculation, it is determined that the topological properties and superconductivity coexist in SnS with the Pm3¯m phase. The nonmonotonic variation of Tc in SnS with pressure is attributed to the electron-phonon coupling effect. Additionally, this study marks a confirmation of the structural phase transitions in SnS under high pressure. Our study contributes to a deeper understanding of the intricate relationship between structure and performance in extreme conditions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SnS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | 46.1 GPa | onset |
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