Anisotropic superconductivity and quantum oscillations in the layered dichalcogenide TaSnS2
| Autor: | Matej Bobnar, K. M. Ranjith, Manuel Feig, Michael Baenitz, Walter Schnelle, Jens Kortus, Elena Hassinger, Tina Weigel, Sergiy Medvediev, Roman Gumeniuk, Dirk C. Meyer, Andreas Leithe-Jasper, Klaus Lüders, Marcel Naumann |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Quantum oscillations Fermi surface 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Magnetization Effective mass (solid-state physics) Electrical resistivity and conductivity Condensed Matter::Superconductivity 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Raman spectroscopy Single crystal |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | ${\mathrm{TaSnS}}_{2}$ 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 $B\ensuremath{\parallel}c$ and $B\ensuremath{\perp}\phantom{\rule{0.16em}{0ex}}c$. 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 $\ensuremath{\approx}3\phantom{\rule{0.28em}{0ex}}\mathrm{GPa}$ 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 $\ensuremath{\approx}0.5{m}_{\mathrm{e}}$. 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. |
| Databáze: | OpenAIRE |
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