Unconventional superconductivity in topological Kramers nodal-line semimetals

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Tian Shang
  • Jianzhou Zhao
  • Lun-Hui Hu
  • Dariusz Jakub Gawryluk
  • Xiaoyan Zhu
  • Hui Zhang
  • Zhixuan Zhen
  • Bocheng Yu
  • Yang Xu
  • Qingfan Zhan
  • Ekaterina Pomjakushina
  • Ming Shi
  • Toni Shiroka

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Detail(s)

Original languageEnglish
Article numbereabq6589
Journal / PublicationScience Advances
Volume8
Issue number43
Online published28 Oct 2022
Publication statusPublished - Oct 2022

Link(s)

Abstract

Crystalline symmetry is a defining factor of the electronic band topology in solids, where many-body interactions often induce a spontaneous breaking of symmetry. Superconductors lacking an inversion center are among the best systems to study such effects or even to achieve topological superconductivity. Here, we demonstrate that TRuSi materials (with T a transition metal) belong to this class. Their bulk normal states behave as three-dimensional Kramers nodal-line semimetals, characterized by large antisymmetric spin-orbit couplings and by hourglass-like dispersions. Our muon-spin spectroscopy measurements show that certain TRuSi compounds spontaneously break the time-reversal symmetry at the superconducting transition, while unexpectedly showing a fully gapped superconductivity. Their unconventional behavior is consistent with a unitary (s + ip) pairing, reflecting a mixture of spin singlets and spin triplets. By combining an intrinsic time-reversal symmetry-breaking superconductivity with nontrivial electronic bands, TRuSi compounds provide an ideal platform for investigating the rich interplay between unconventional superconductivity and the exotic properties of Kramers nodal-line/hourglass fermions.

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Citation Format(s)

Unconventional superconductivity in topological Kramers nodal-line semimetals. / Shang, Tian; Zhao, Jianzhou; Hu, Lun-Hui et al.
In: Science Advances, Vol. 8, No. 43, eabq6589, 10.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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