Leading superconducting instabilities in three-dimensional models for
Abstract
The unconventional superconductor Sr2RuO4 has been the subject of enormous interest over more than two decades, but until now the form of its order parameter has not been explicitly determined. Since groundbreaking NMR experiments revealed recently that the pairs are of dominant spin-singlet character, attention has focused on time-reversal symmetry breaking linear combinations of s-, d-, and g-wave one-dimensional (1D) irreducible representations. However, a state of the form dxz+idyz corresponding to the two-dimensional representation Eg has also been proposed based on some experiments. We present a systematic study of the stability of various superconducting candidate states, assuming that pairing is driven by the fluctuation exchange mechanism, including a realistic three-dimensional Fermi surface, full treatment of both local and nonlocal spin-orbit couplings, and a wide range of Hubbard-Kanamori interaction parameters U,J,U',J'. The leading superconducting instabilities are found to exhibit nodal even-parity A1g(s') or B1g(dx2-y2) symmetries, similar to the findings in two-dimensional models without longer-range Coulomb interaction which tends to favor dxy over dx2-y2. Within the so-called Hund's coupling mean-field pairing scenario, the Eg(dxz/dyz) solution can be stabilized for large J and specific forms of the spin-orbit coupling, but for all cases studied here the eigenvalues of other superconducting solutions are significantlymore »
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 2325226
- Alternate Identifier(s):
- OSTI ID: 1883857
- Grant/Contract Number:
- FG02-05ER46236; AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Research
- Additional Journal Information:
- Journal Name: Physical Review Research Journal Volume: 4 Journal Issue: 3; Journal ID: ISSN 2643-1564
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; multiband superconductivity; pairing mechanisms; superconducting order parameters
Citation Formats
Rømer, Astrid T., Maier, T. A., Kreisel, Andreas, Hirschfeld, P. J., and Andersen, Brian M. Leading superconducting instabilities in three-dimensional models for Sr 2 RuO 4. United States: N. p., 2022.
Web. doi:10.1103/PhysRevResearch.4.033011.
Rømer, Astrid T., Maier, T. A., Kreisel, Andreas, Hirschfeld, P. J., & Andersen, Brian M. Leading superconducting instabilities in three-dimensional models for Sr 2 RuO 4. United States. https://doi.org/10.1103/PhysRevResearch.4.033011
Rømer, Astrid T., Maier, T. A., Kreisel, Andreas, Hirschfeld, P. J., and Andersen, Brian M. Tue .
"Leading superconducting instabilities in three-dimensional models for Sr 2 RuO 4". United States. https://doi.org/10.1103/PhysRevResearch.4.033011.
@article{osti_2325226,
title = {Leading superconducting instabilities in three-dimensional models for Sr 2 RuO 4},
author = {Rømer, Astrid T. and Maier, T. A. and Kreisel, Andreas and Hirschfeld, P. J. and Andersen, Brian M.},
abstractNote = {The unconventional superconductor Sr2RuO4 has been the subject of enormous interest over more than two decades, but until now the form of its order parameter has not been explicitly determined. Since groundbreaking NMR experiments revealed recently that the pairs are of dominant spin-singlet character, attention has focused on time-reversal symmetry breaking linear combinations of s-, d-, and g-wave one-dimensional (1D) irreducible representations. However, a state of the form dxz+idyz corresponding to the two-dimensional representation Eg has also been proposed based on some experiments. We present a systematic study of the stability of various superconducting candidate states, assuming that pairing is driven by the fluctuation exchange mechanism, including a realistic three-dimensional Fermi surface, full treatment of both local and nonlocal spin-orbit couplings, and a wide range of Hubbard-Kanamori interaction parameters U,J,U',J'. The leading superconducting instabilities are found to exhibit nodal even-parity A1g(s') or B1g(dx2-y2) symmetries, similar to the findings in two-dimensional models without longer-range Coulomb interaction which tends to favor dxy over dx2-y2. Within the so-called Hund's coupling mean-field pairing scenario, the Eg(dxz/dyz) solution can be stabilized for large J and specific forms of the spin-orbit coupling, but for all cases studied here the eigenvalues of other superconducting solutions are significantly larger when the full fluctuation exchange vertex is included in the pairing kernel. Additionally, we compute the spin susceptibility in relevant superconducting candidate phases and compare to recent neutron scattering and nuclear magnetic resonance (NMR) Knight shift measurements. It is found that dxz+idyz order supports a neutron resonance in its superconducting phase, in contrast to a recent experiment [K. Jenni et al., Phys. Rev. B 103, 104511 (2021)], whereas s'+idx2-y2 does not. Furthermore, comparison of the Knight shift reveals that s'+idx2-y2 exhibits a larger low-temperature shift than dxz+idyz.},
doi = {10.1103/PhysRevResearch.4.033011},
journal = {Physical Review Research},
number = 3,
volume = 4,
place = {United States},
year = {Tue Jul 05 00:00:00 EDT 2022},
month = {Tue Jul 05 00:00:00 EDT 2022}
}
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