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<p>The wavefunction of Cooper pairs in superconductors is characterized by the spin and orbital angular momenta of their constituent electrons. Given the fermionic nature of electrons, a Cooper pair must be antisymmetric with respect to the exchange of the particles that compose it. Nearly all stoichiometric superconductors host spin-singlet Cooper pairs with zero angular momentum and spin. An important exception are a small number of uranium-based heavy fermion materials believed to support odd angular momentum, spin-triplet states. Therefore, discovery of different triplet superconducting materials is important for understanding unconventional superconductivity. Here we show that the natural superlattice material BaTa<sub>2</sub>S<sub>5</sub> without doping supports a high-field, clean-limit superconducting state persisting to at least 60 T. Arising at a first-order transition out of an Ising-like superconducting phase, this state is highly two-dimensional and consistent with a field-induced triplet pairing. These results suggest that a broad family of spin-triplet, two-dimensional, <i>d</i>-electron superconductors can be created by tuning of spin–orbit coupling, dimensionality and electronic quality. Looking forward, the rare presence of multiple superconducting phases along with crystallographic symmetries supporting <i>p</i>- or <i>f</i>-wave pairing in these systems may lead to new materials for high-field and topological superconductivity.</p>

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High-field triplet superconductivity in a transition metal dichalcogenide superlattice

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • S. Y. Frank Zhao,
  • Paul M. Neves,
  • Joshua P. Wakefield,
  • Shiang Fang,
  • Alan Chen,
  • Johanna C. Palmstrom,
  • David E. Graf,
  • Avi Auslender,
  • David C. Bell,
  • Pavel A. Volkov,
  • Takehito Suzuki,
  • Joseph G. Checkelsky

摘要

The wavefunction of Cooper pairs in superconductors is characterized by the spin and orbital angular momenta of their constituent electrons. Given the fermionic nature of electrons, a Cooper pair must be antisymmetric with respect to the exchange of the particles that compose it. Nearly all stoichiometric superconductors host spin-singlet Cooper pairs with zero angular momentum and spin. An important exception are a small number of uranium-based heavy fermion materials believed to support odd angular momentum, spin-triplet states. Therefore, discovery of different triplet superconducting materials is important for understanding unconventional superconductivity. Here we show that the natural superlattice material BaTa2S5 without doping supports a high-field, clean-limit superconducting state persisting to at least 60 T. Arising at a first-order transition out of an Ising-like superconducting phase, this state is highly two-dimensional and consistent with a field-induced triplet pairing. These results suggest that a broad family of spin-triplet, two-dimensional, d-electron superconductors can be created by tuning of spin–orbit coupling, dimensionality and electronic quality. Looking forward, the rare presence of multiple superconducting phases along with crystallographic symmetries supporting p- or f-wave pairing in these systems may lead to new materials for high-field and topological superconductivity.