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PreprintarXiv licencearXiv

Orientation-resolved tunnel spectroscopy of a triplet superconductor

  • Marcel Strohmeier
  • Andriy Smolyanyuk
  • Karsten Held
  • Michael Smidman
  • Geetha Balakrishnan
  • Wolfgang Belzig
  • Elke Scheer
  • Angelo Di Bernardo
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Abstract

Although Cooper pairs in superconductors generally condense into a spin-singlet state, spin-triplet superconductivity has attracted sustained interest since it enables dissipationless spin transport and is an important requirement for manifold topological quantum technologies. Noncentrosymmetric superconductors provide a promising route to triplet pairing because their intrinsic antisymmetric spin-orbit coupling (ASOC) can mix spin-singlet and spin-triplet states. To date, the strongest evidence for such mixed-parity superconductivity has been reported in heavy-fermion systems, where strong electronic correlations obscure the role of ASOC. Whether ASOC alone can support a substantial spin-triplet component remains unresolved. Here we show that the weakly correlated noncentrosymmetric superconductor Nb18Re82 (Nb-Re) hosts a mixed-parity superconducting state with a substantial spin-triplet contribution. Orientation-resolved low-temperature scanning tunneling spectroscopy reveals a strongly anisotropic quasiparticle density of states. A symmetry-constrained analysis shows that the spectroscopic dataset is explained by an order parameter combining a nodal spin-singlet component with a spin-triplet contribution reaching up to half of the singlet amplitude. These findings provide a momentum-resolved determination of a mixed-parity superconducting order parameter and demonstrate that ASOC alone can foster a substantial spin-triplet component. More broadly, they establish orientation-resolved tunneling spectroscopy as a route to identifying mixed-parity superconducting states and suggest that triplet superconductivity may be more widespread among noncentrosymmetric materials than previously recognized.

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Cite

BibTeXRIS
BibTeX
@misc{strohmeier2026orientationresolved,
  title = {{Orientation-resolved tunnel spectroscopy of a triplet superconductor}},
  author = {Marcel Strohmeier and Andriy Smolyanyuk and Karsten Held and Michael Smidman and Geetha Balakrishnan and Wolfgang Belzig and Elke Scheer and Angelo Di Bernardo},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.04742},
  eprint = {2606.04742},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.04742},
}
RIS
TY  - UNPB
TI  - Orientation-resolved tunnel spectroscopy of a triplet superconductor
AU  - Marcel Strohmeier
AU  - Andriy Smolyanyuk
AU  - Karsten Held
AU  - Michael Smidman
AU  - Geetha Balakrishnan
AU  - Wolfgang Belzig
AU  - Elke Scheer
AU  - Angelo Di Bernardo
PY  - 2026
DA  - 2026/10/19
PB  - arXiv
DO  - 10.48550/arxiv.2606.04742
UR  - https://arxiv.org/abs/2606.04742
AB  - Although Cooper pairs in superconductors generally condense into a spin-singlet state, spin-triplet superconductivity has attracted sustained interest since it enables dissipationless spin transport and is an important requirement for manifold topological quantum technologies. Noncentrosymmetric superconductors provide a promising route to triplet pairing because their intrinsic antisymmetric spin-orbit coupling (ASOC) can mix spin-singlet and spin-triplet states. To date, the strongest evidence for such mixed-parity superconductivity has been reported in heavy-fermion systems, where strong electronic correlations obscure the role of ASOC. Whether ASOC alone can support a substantial spin-triplet component remains unresolved. Here we show that the weakly correlated noncentrosymmetric superconductor Nb_18Re_82 (Nb-Re) hosts a mixed-parity superconducting state with a substantial spin-triplet contribution. Orientation-resolved low-temperature scanning tunneling spectroscopy reveals a strongly anisotropic quasiparticle density of states. A symmetry-constrained analysis shows that the spectroscopic dataset is explained by an order parameter combining a nodal spin-singlet component with a spin-triplet contribution reaching up to half of the singlet amplitude. These findings provide a momentum-resolved determination of a mixed-parity superconducting order parameter and demonstrate that ASOC alone can foster a substantial spin-triplet component. More broadly, they establish orientation-resolved tunneling spectroscopy as a route to identifying mixed-parity superconducting states and suggest that triplet superconductivity may be more widespread among noncentrosymmetric materials than previously recognized.
ER  -