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  Spin-triplet superconductivity in Weyl nodal-line semimetals

Shang, T., Ghosh, S. K., Smidman, M., Gawryluk, D. J., Baines, C., Wang, A., et al. (2022). Spin-triplet superconductivity in Weyl nodal-line semimetals. npj Quantum Materials, 7(1): 35, pp. 1-9. doi:10.1038/s41535-022-00442-w.

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Shang, Tian1, Author
Ghosh, Sudeep K.1, Author
Smidman, Michael1, Author
Gawryluk, Dariusz Jakub1, Author
Baines, Christopher1, Author
Wang, An1, Author
Xie, Wu1, Author
Chen, Ye1, Author
Ajeesh, Mukkattu O.2, Author              
Nicklas, Michael3, Author              
Pomjakushina, Ekaterina1, Author
Medarde, Marisa1, Author
Shi, Ming1, Author
Annett, James F.1, Author
Yuan, Huiqiu1, Author
Quintanilla, Jorge1, Author
Shiroka, Toni1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863472              

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 Abstract: Topological semimetals are three dimensional materials with symmetry-protected massless bulk excitations. As a special case, Weyl nodal-line semimetals are realized in materials having either no inversion or broken time-reversal symmetry and feature bulk nodal lines. The 111-family, including LaNiSi, LaPtSi and LaPtGe materials (all lacking inversion symmetry), belongs to this class. Here, by combining muon-spin rotation and relaxation with thermodynamic measurements, we find that these materials exhibit a fully-gapped superconducting ground state, while spontaneously breaking time-reversal symmetry at the superconducting transition. Since time-reversal symmetry is essential for protecting the normal-state topology, its breaking upon entering the superconducting state should remarkably result in a topological phase transition. By developing a minimal model for the normal-state band structure and assuming a purely spin-triplet pairing, we show that the superconducting properties across this family can be described accurately. Our results demonstrate that the 111 materials reported here provide an ideal test-bed for investigating the rich interplay between the exotic properties of Weyl nodal-line fermions and unconventional superconductivity.

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Language(s): eng - English
 Dates: 2022-03-252022-03-25
 Publication Status: Published in print
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Title: npj Quantum Materials
  Other : npj Quantum Mater.
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 7 (1) Sequence Number: 35 Start / End Page: 1 - 9 Identifier: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648