Superconductivity in multiorbital systems with repulsive interactions: Hund's pairing versus spin-fluctuation pairing
Abstract
Hund's pairing refers to Cooper pairing generated by onsite interactions that become attractive due to large Hund's exchange J. This is possible in multiorbital systems even when all local bare interactions are repulsive, since attractions in specific channels are given by certain linear combinations of interaction parameters. On the other hand, pairing processes such as the exchange of spin fluctuations are also present. We compare mean-field Hund's pairing and spin-fluctuation-mediated pairing using electronic bands appropriate for different classes of multiorbital systems over a wide range of interaction parameters. We find that, for systems without clear nesting features, the superconducting state generated by the Hund's mechanism agrees well with that from the full fluctuation exchange vertex when Hund's exchange and spin-orbit coupling are sufficiently large. On the other hand, for systems characterized by a peaked finite-momentum particle-hole susceptibility, spin-fluctuation pairing generally dominates over Hund's pairing. From this perspective Hund's pairing states appear unlikely to be realized in systems like Sr2RuO4 and generic iron-based superconductors.
- Authors:
-
[1];
[2];
- Univ. of Copenhagen (Denmark)
- Univ. of Leipzig (Germany)
- 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); Novo Nordisk Foundation; Independent Research Fund Denmark
- OSTI Identifier:
- 1979823
- Grant/Contract Number:
- FG02-05ER46236; NNF20OC0060019; 8021-00047B
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 10; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Physics; multiband superconductivity; superconducting phase transition; iron-based superconductors; ruthenates; unconventional superconductors; BCS theory
Citation Formats
Roig, Mercè, Rømer, Astrid T., Kreisel, Andreas, Hirschfeld, P. J., and Andersen, Brian M. Superconductivity in multiorbital systems with repulsive interactions: Hund's pairing versus spin-fluctuation pairing. United States: N. p., 2022.
Web. doi:10.1103/physrevb.106.l100501.
Roig, Mercè, Rømer, Astrid T., Kreisel, Andreas, Hirschfeld, P. J., & Andersen, Brian M. Superconductivity in multiorbital systems with repulsive interactions: Hund's pairing versus spin-fluctuation pairing. United States. https://doi.org/10.1103/physrevb.106.l100501
Roig, Mercè, Rømer, Astrid T., Kreisel, Andreas, Hirschfeld, P. J., and Andersen, Brian M. Fri .
"Superconductivity in multiorbital systems with repulsive interactions: Hund's pairing versus spin-fluctuation pairing". United States. https://doi.org/10.1103/physrevb.106.l100501. https://www.osti.gov/servlets/purl/1979823.
@article{osti_1979823,
title = {Superconductivity in multiorbital systems with repulsive interactions: Hund's pairing versus spin-fluctuation pairing},
author = {Roig, Mercè and Rømer, Astrid T. and Kreisel, Andreas and Hirschfeld, P. J. and Andersen, Brian M.},
abstractNote = {Hund's pairing refers to Cooper pairing generated by onsite interactions that become attractive due to large Hund's exchange J. This is possible in multiorbital systems even when all local bare interactions are repulsive, since attractions in specific channels are given by certain linear combinations of interaction parameters. On the other hand, pairing processes such as the exchange of spin fluctuations are also present. We compare mean-field Hund's pairing and spin-fluctuation-mediated pairing using electronic bands appropriate for different classes of multiorbital systems over a wide range of interaction parameters. We find that, for systems without clear nesting features, the superconducting state generated by the Hund's mechanism agrees well with that from the full fluctuation exchange vertex when Hund's exchange and spin-orbit coupling are sufficiently large. On the other hand, for systems characterized by a peaked finite-momentum particle-hole susceptibility, spin-fluctuation pairing generally dominates over Hund's pairing. From this perspective Hund's pairing states appear unlikely to be realized in systems like Sr2RuO4 and generic iron-based superconductors.},
doi = {10.1103/physrevb.106.l100501},
journal = {Physical Review. B},
number = 10,
volume = 106,
place = {United States},
year = {Fri Sep 09 00:00:00 EDT 2022},
month = {Fri Sep 09 00:00:00 EDT 2022}
}
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