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<p>Layered transition metal dichalcogenides (TMDs) are model systems to investigate the interplay between superconductivity and the charge density wave (CDW) order. Here, we use muon spin rotation and relaxation (<i>μ</i><sup>+</sup>SR) to probe the superconducting ground state of polycrystalline 2H-TaS<sub>2</sub>, which hosts a CDW transition at 76&#xa0;K and superconductivity below 1&#xa0;K. The <i>μ</i><sup>+</sup>SR measurements, conducted down to 0.27&#xa0;K, are consistent with a nodeless, BCS-like single-gap <i>s</i>-wave state. Fits to the temperature dependence of the depolarization rate and Knight shift measurements support spin-singlet pairing. Crucially, no evidence of time-reversal symmetry breaking (TRSB) is observed, distinguishing 2H-TaS<sub>2</sub> from polymorphs like 4Hb-TaS<sub>2</sub>, where TRSB and unconventional superconductivity have been reported. These findings establish 2H-TaS<sub>2</sub> as a canonical BCS superconductor and provide a reference point for understanding the diverse electronic ground states that emerge in structurally distinct TMD polymorphs.</p>

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Hallmark features of conventional BCS superconductivity in 2H-TaS2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月23日

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  • Frank Elson,
  • Ola Kenji Forslund,
  • Rasmus Palm,
  • Ahmed Alshemi,
  • Mahmoud Abdel-Hafiez,
  • Gediminas Simutis,
  • Toni Shiroka,
  • Debarchan Das,
  • Elizabeth Blackburn,
  • Jonas Weissenrieder,
  • Yasmine Sassa,
  • Martin Månsson

摘要

Layered transition metal dichalcogenides (TMDs) are model systems to investigate the interplay between superconductivity and the charge density wave (CDW) order. Here, we use muon spin rotation and relaxation (μ+SR) to probe the superconducting ground state of polycrystalline 2H-TaS2, which hosts a CDW transition at 76 K and superconductivity below 1 K. The μ+SR measurements, conducted down to 0.27 K, are consistent with a nodeless, BCS-like single-gap s-wave state. Fits to the temperature dependence of the depolarization rate and Knight shift measurements support spin-singlet pairing. Crucially, no evidence of time-reversal symmetry breaking (TRSB) is observed, distinguishing 2H-TaS2 from polymorphs like 4Hb-TaS2, where TRSB and unconventional superconductivity have been reported. These findings establish 2H-TaS2 as a canonical BCS superconductor and provide a reference point for understanding the diverse electronic ground states that emerge in structurally distinct TMD polymorphs.