Exotic Oddness in Superconducting Sr2RuO4

ORAL

Abstract

The superconducting gap symmetry of Sr2RuO4 is still under debate. Most experiments suggest a triplet state, yet the best candidate order-parameter for odd-parity pairing fails to explain all experiments[1]. The most problematic issue is that the presence of nodes on the Fermi surface would rather support a d-wave symmetry[2]. A less discussed pairing function is odd-frequency Cooper pairing which may explain the intrinsic Kerr effect in this system[3]. In our study, we solve the frequency dependent Eliashberg equation[4] to investigate whether or not this pairing symmetry appears in the leading gap symmetries of Sr2RuO4. We used a DFT+DMFT calculation to calculate its spin excitation spectra and in turn the spin-fluctuation mediated pairing interaction. Focusing on the triplet pairing channel, we show that Sr2RuO4 has a stronger tendency towards odd-frequency superconductivity than towards any p-wave state.

[1] Mackenzie et al., npj Quantum Materials 2, 40 (2017)
[2] Hassinger et al., Phys. Rev. X 7, 011032 (2017)
[3] Komendová and Black-Schaffer, Phys. Rev. Lett. 119, 087001 (2017)
[4] Nourafkan et al., Phys. Rev. Lett. 117, 137001 (2016)

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Presenters

  • Olivier Gingras

    University of Montreal

Authors

  • Olivier Gingras

    University of Montreal

  • Reza Nourafkan

    University of Sherbrooke and Institut quantique, Physique, Université de Sherbrooke and Institut quantique

  • A.-M. Tremblay

    Physique, Université de Sherbrooke and Institut quantique, University of Sherbrooke and Institut quantique

  • Michel Cote

    Univ of Montreal, University of Montreal, Physics, Université de Montréal, Département de Physique, Université de Montréal, Physics, Univ of Montreal