Knight Shift and Leading Superconducting Instability from Spin Fluctuations in Sr2RuO4

Rømer, A. T.; Scherer, D. D.; Eremin, I. M.; Hirschfeld, P. J.; Andersen, B. M.

doi:10.1103/PhysRevLett.123.247001

Title: Knight Shift and Leading Superconducting Instability from Spin Fluctuations in ${Sr}_{2} {RuO}_{4}$

Journal Article · 13 December 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.123.247001 · OSTI ID:1603844

^[1]; Scherer, D. D. ^[2]; Eremin, I. M. ^[3]; Hirschfeld, P. J. ^[4]; Andersen, B. M. ^[2]

Univ. of Copenhagen (Denmark); Institut Laue-Langevin (France)
Univ. of Copenhagen (Denmark)
Ruhr-Universität Bochum (Germany); National Univ. of Science and Technology MISiS, Moscow (Germany)
Univ. of Florida, Gainesville, FL (United States)

We report that recent nuclear magnetic resonance studies [A. Pustogow et al., Nature 574, 72 (2019)] have challenged the prevalent chiral triplet pairing scenario proposed for ${Sr}_{2} {RuO}_{4}$ . To provide guidance from microscopic theory as to which other pair states might be compatible with the new data, we perform a detailed theoretical study of spin fluctuation mediated pairing for this compound. We map out the phase diagram as a function of spin-orbit coupling, interaction parameters, and band structure properties over physically reasonable ranges, comparing when possible with photoemission and inelastic neutron scattering data information. We find that even-parity pseudospin singlet solutions dominate large regions of the phase diagram, but in certain regimes spin-orbit coupling favors a near-nodal odd-parity triplet superconducting state, which is either helical or chiral depending on the proximity of the $γ$ band to the van Hove points. A surprising near degeneracy of the nodal $s^{'}$ and $d_{x^{2} - y^{2}}$ wave solutions leads to the possibility of a near-nodal time-reversal symmetry broken $s^{'} + i d_{x^{2} - y^{2}}$ pair state. Lastly, predictions for the temperature dependence of the Knight shift for fields in and out of plane are presented for all states.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Russian Federation

Grant/Contract Number:: FG02-05ER46236; K2-2017-085

OSTI ID:: 1603844

Journal Information:: Physical Review Letters, Vol. 123, Issue 24; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 56 works

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References (51)

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Title: Knight Shift and Leading Superconducting Instability from Spin Fluctuations in Sr 2 RuO 4

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Title: Knight Shift and Leading Superconducting Instability from Spin Fluctuations in ${Sr}_{2} {RuO}_{4}$