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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:
Journal Article: 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. doi: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},
url = {https://www.osti.gov/biblio/1603844}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 24,
volume = 123,
place = {United States},
year = {2019},
month = {12}
}

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Cited by: 5 works
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Works referenced in this record:

Even odder after twenty-three years: the superconducting order parameter puzzle of Sr2RuO4
journal, July 2017


Phenomenology of the superconducting state in Sr2RuO4
journal, May 1999


Anisotropic pairing in superconducting Sr 2 RuO 4 : Ru NMR and NQR studies
journal, July 1997


Spin polarization enhanced by spin-triplet pairing in Sr 2 RuO 4 probed by NMR
journal, September 2015


Spin-triplet superconductivity in Sr2RuO4 identified by 17O Knight shift
journal, December 1998


Absence of the O 17 Knight-shift changes across the first-order phase transition line in Sr 2 RuO 4
journal, November 2016


Evidence for Incommensurate Spin Fluctuations in Sr 2 RuO 4
journal, October 1999


Inelastic neutron scattering study of magnetic excitations in Sr 2 RuO 4
journal, August 2002


Anisotropy of the Incommensurate Fluctuations in S r 2 R u O 4 : A Study with Polarized Neutrons
journal, March 2004


Spin Fluctuations in Sr 2 RuO 4 from Polarized Neutron Scattering: Implications for Superconductivity
journal, February 2019


Effect of Ferromagnetic Spin Correlations on Superconductivity
journal, August 1966


Electronic band structure of the superconductor Sr 2 RuO 4
journal, January 1995


The role of spin-orbit coupling for the superconducting state in Sr 2 RuO 4
journal, February 2000


Spin-orbit coupling and symmetry of the order parameter in strontium ruthenate
journal, April 2006


Strong Spin-Orbit Coupling Effects on the Fermi Surface of Sr 2 RuO 4 and Sr 2 RhO 4
journal, July 2008


Renormalized band structure of Sr2RuO4: A quasiparticle tight-binding approach
journal, December 2013


Electronic theory for the normal-state spin dynamics in Sr 2 RuO 4 : Anisotropy due to spin-orbit coupling
journal, May 2002


Anisotropic spin fluctuations in Sr 2 RuO 4 : Role of spin-orbit coupling and induced strain
journal, December 2016


Superconductivity in the repulsive Hubbard model: An asymptotically exact weak-coupling solution
journal, June 2010


Theory of superconductivity in a three-orbital model of Sr 2 RuO 4
journal, October 2013


Pairing symmetry and dominant band in Sr 2 RuO 4
journal, June 2014


Superconducting pairing in Sr 2 RuO 4 from weak to intermediate coupling
journal, February 2018


Superconducting Symmetries of Sr 2 RuO 4 from First-Principles Electronic Structure
journal, November 2019


Theory of Chiral p -Wave Superconductivity with Near Nodes for Sr 2 RuO 4
journal, January 2019


Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance
journal, September 2019


Spin-Orbit Coupling and Electronic Correlations in Sr 2 RuO 4
journal, March 2018


Pairing symmetry of the one-band Hubbard model in the paramagnetic weak-coupling limit: A numerical RPA study
journal, September 2015


Phenomenological theory of unconventional superconductivity
journal, April 1991


Inelastic neutron scattering study of the magnetic fluctuations in Sr 2 RuO 4
journal, August 2011


Paramagnetic Susceptibility in Superconductors
journal, May 1958


Vertical Line Nodes in the Superconducting Gap Structure of Sr 2 RuO 4
journal, March 2017


Universal Heat Transport in Sr 2 RuO 4
journal, May 2002


Anisotropic Superconducting Gap in the Spin-Triplet Superconductor Sr 2 RuO 4 : Evidence from a Ru-NQR Study
journal, June 2000


Temperature Dependence of the Penetration Depth in Sr 2 RuO 4 : Evidence for Nodes in the Gap Function
journal, November 2000


Very low temperature thermal conductivity in the layered perovskite superconductor
journal, August 1998


Coherence-Incoherence Crossover and the Mass-Renormalization Puzzles in Sr 2 RuO 4
journal, March 2011


Orbital selective pairing and gap structures of iron-based superconductors
journal, May 2017


Discovery of orbital-selective Cooper pairing in FeSe
journal, July 2017


Time-reversal symmetry-breaking superconductivity in Sr2RuO4
journal, August 1998


Polar Kerr effect as probe for time-reversal symmetry breaking in unconventional superconductors
journal, May 2009


    Works referencing / citing this record:

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