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  Unsplit superconducting and time reversal symmetry breaking transitions in Sr2RuO4 under hydrostatic pressure and disorder

Grinenko, V., Das, D., Gupta, R., Zinkl, B., Kikugawa, N., Maeno, Y., et al. (2021). Unsplit superconducting and time reversal symmetry breaking transitions in Sr2RuO4 under hydrostatic pressure and disorder. Nature Communications, 12: 3920, pp. 1-10. doi:10.1038/s41467-021-24176-8.

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Grinenko, Vadim1, Author
Das, Debarchan1, Author
Gupta, Ritu1, Author
Zinkl, Bastian1, Author
Kikugawa, Naoki1, Author
Maeno, Yoshiteru1, Author
Hicks, Clifford W.2, Author              
Klauss, Hans-Henning1, Author
Sigrist, Manfred1, Author
Khasanov, Rustem1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863466              

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 Abstract: There is considerable evidence that the superconducting state of Sr2RuO4 breaks time reversal symmetry. In the experiments showing time reversal symmetry breaking, its onset temperature, TTRSB, is generally found to match the critical temperature, Tc, within resolution. In combination with evidence for even parity, this result has led to consideration of a dxz ± idyz order parameter. The degeneracy of the two components of this order parameter is protected by symmetry, yielding TTRSB = Tc, but it has a hard-to-explain horizontal line node at kz = 0. Therefore, s ± id and d ± ig order parameters are also under consideration. These avoid the horizontal line node, but require tuning to obtain TTRSB ≈ Tc. To obtain evidence distinguishing these two possible scenarios (of symmetry-protected versus accidental degeneracy), we employ zero-field muon spin rotation/relaxation to study pure Sr2RuO4 under hydrostatic pressure, and Sr1.98La0.02RuO4 at zero pressure. Both hydrostatic pressure and La substitution alter Tc without lifting the tetragonal lattice symmetry, so if the degeneracy is symmetry-protected, TTRSB should track changes in Tc, while if it is accidental, these transition temperatures should generally separate. We observe TTRSB to track Tc, supporting the hypothesis of dxz ± idyz order. © 2021, The Author(s).

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Language(s): eng - English
 Dates: 2021-06-242021-06-24
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/s41467-021-24176-8
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 Sequence Number: 3920 Start / End Page: 1 - 10 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723