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

Abstract

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.

Authors:
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)
Publication Date:
Research Org.:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Russian Federation
OSTI Identifier:
1603844
Grant/Contract Number:  
FG02-05ER46236; K2-2017-085
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Multiband superconductivity; Pairing mechanisms; Spin-orbit coupling; Superconducting order parameter

Citation Formats

Rømer, A. T., Scherer, D. D., Eremin, I. M., Hirschfeld, P. J., and Andersen, B. M.. Knight Shift and Leading Superconducting Instability from Spin Fluctuations in Sr2RuO4. United States: N. p., 2019. Web. https://doi.org/10.1103/PhysRevLett.123.247001.
Rømer, A. T., Scherer, D. D., Eremin, I. M., Hirschfeld, P. J., & Andersen, B. M.. Knight Shift and Leading Superconducting Instability from Spin Fluctuations in Sr2RuO4. United States. https://doi.org/10.1103/PhysRevLett.123.247001
Rømer, A. T., Scherer, D. D., Eremin, I. M., Hirschfeld, P. J., and Andersen, B. M.. Fri . "Knight Shift and Leading Superconducting Instability from Spin Fluctuations in Sr2RuO4". United States. https://doi.org/10.1103/PhysRevLett.123.247001. https://www.osti.gov/servlets/purl/1603844.
@article{osti_1603844,
title = {Knight Shift and Leading Superconducting Instability from Spin Fluctuations in Sr2RuO4},
author = {Rømer, A. T. and Scherer, D. D. and Eremin, I. M. and Hirschfeld, P. J. and Andersen, B. M.},
abstractNote = {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 Sr2RuO4. 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 dx2-y2 wave solutions leads to the possibility of a near-nodal time-reversal symmetry broken s'+idx2-y2 pair state. Lastly, predictions for the temperature dependence of the Knight shift for fields in and out of plane are presented for all states.},
doi = {10.1103/PhysRevLett.123.247001},
journal = {Physical Review Letters},
number = 24,
volume = 123,
place = {United States},
year = {2019},
month = {12}
}

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    Works referencing / citing this record:

    Spin-orbit coupling and spin-triplet pairing symmetry in Sr 2 RuO 4
    journal, February 2020