Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

Badger, Jackson R.; Quan, Yundi; Staab, Matthew C.; Sumita, Shuntaro; Rossi, Antonio; Devlin, Kasey P.; Neubauer, Kelly; Shulman, Daniel S.; Fettinger, James C.; Klavins, Peter; Kauzlarich, Susan M.; Aoki, Dai; Vishik, Inna M.; Pickett, Warren E.; Taufour, Valentin

doi:10.1038/s42005-021-00771-5

Title: Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa₂

Journal Article · 13 January 2022 · Communications Physics

DOI: https://doi.org/10.1038/s42005-021-00771-5 · OSTI ID:1848072

Badger, Jackson R. ^[1]; Quan, Yundi ^[2];

^[3];

^[4]; Rossi, Antonio ^[5];

^[1]; Neubauer, Kelly ^[3];

^[1];

^[1]; Klavins, Peter ^[3];

^[1]; Aoki, Dai ^[6];

^[3];

^[3]; Taufour, Valentin ^[3]

Univ. of California, Berkeley, CA (United States)
Univ. of Florida, Gainesville, FL (United States); Univ. of California, Davis, CA (United States)
Univ. of California, Davis, CA (United States)
Riken CPR, Wako (Japan)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Davis, CA (United States)
Tohoku Univ., Oarai (Japan)

Unconventional superconductors have Cooper pairs with lower symmetries than in conventional superconductors. In most unconventional superconductors, the additional symmetry breaking occurs in relation to typical ingredients such as strongly correlated Fermi liquid phases, magnetic fluctuations, or strong spin-orbit coupling in noncentrosymmetric structures. In this article, we show that the time-reversal symmetry breaking in the superconductor LaNiGa₂ is enabled by its previously unknown topological electronic band structure, with Dirac lines and a Dirac loop at the Fermi level. Two symmetry related Dirac points even remain degenerate under spin-orbit coupling. These unique topological features enable an unconventional superconducting gap in which time-reversal symmetry can be broken in the absence of other typical ingredients. Our findings provide a route to identify a new type of unconventional superconductors based on nonsymmorphic symmetries and will enable future discoveries of topological crystalline superconductors.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); GIMRT; Air Force Office of Scientific Research (AFOSR); JST CREST; National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1848072

Journal Information:: Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 5; ISSN 2399-3650

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

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Title: Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa₂