${\mathrm{TaSnS}}_2$ single crystal and polycrystalline samples are investigated in detail by magnetization, electrical resistivity, and specific heat as well as Raman spectroscopy and nuclear magnetic resonance (NMR). Studies are focused on the temperature and magnetic field dependence of the superconducting state. We determine the critical fields for both directions $B\parallel c$ and $B\perp c$. Additionally, we investigate the dependence of the resistivity, the critical temperature, and the structure through Raman spectroscopy under high pressure up to 10 GPa. At a pressure of $\approx 3\mathrm{GPa}$ the superconductivity is suppressed below our minimum temperature. The Sn NMR powder spectrum shows a single line which is expected for the ${\mathrm{TaSnS}}_2$ phase and confirms the high sample quality. Pronounced de Haas-van Alphen oscillations in the ac susceptibility of polycrystalline sample reveal two pairs of frequencies indicating coexisting small and large Fermi surfaces. The effective mass of the smaller Fermi surface is $\approx 0.5m_{\mathrm{e}}$. We compare these results with the band structures from DFT calculations. Our findings on ${\mathrm{TaSnS}}_2$ are discussed in terms of a quasi-two-dimensional BCS superconductivity.

中文翻译：

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层状二卤化钨TaSnS2中的各向异性超导和量子振荡

${\mathrm{钽锡}}_2$通过磁化，电阻率和比热以及拉曼光谱和核磁共振（NMR）详细研究了单晶和多晶样品。研究集中于超导状态对温度和磁场的依赖性。我们确定两个方向的关键领域$乙\parallel C$ 和 $乙\perp C$。此外，我们通过高达10 GPa的高压下的拉曼光谱研究电阻率，临界温度和结构的依赖性。在...的压力下$\approx 3\mathrm{GPa}$在低于我们的最低温度时，超导被抑制了。Sn NMR粉末光谱显示一条单线，预期${\mathrm{钽锡}}_2$并确认高样品质量。多晶样品的磁化率中明显的de Haas-van Alphen振荡显示出两对频率，表明小费米表面和大费米表面同时存在。较小的费米面的有效质量为$\approx 0.5{米}_{\mathrm{Ë}}$。我们将这些结果与DFT计算得出的能带结构进行比较。我们的发现${\mathrm{钽锡}}_2$ 根据准二维BCS超导性对它们进行了讨论。