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

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2];  [3];  [4];  [2]
  1. Univ. of Copenhagen (Denmark); Institut Laue-Langevin (France)
  2. Univ. of Copenhagen (Denmark)
  3. Ruhr-Universität Bochum (Germany); National Univ. of Science and Technology MISiS, Moscow (Germany)
  4. 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.

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
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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