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Superconductivity in multiorbital systems with repulsive interactions: Hund's pairing versus spin-fluctuation pairing

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [2]
  1. Univ. of Copenhagen (Denmark); OSTI
  2. Univ. of Copenhagen (Denmark)
  3. Univ. of Leipzig (Germany)
  4. Univ. of Florida, Gainesville, FL (United States)
+ Show Author Affiliations
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.
Research Organization:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Novo Nordisk Foundation; Independent Research Fund Denmark
Grant/Contract Number:
FG02-05ER46236
OSTI ID:
1979823
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
BCS theory
Physics
iron-based superconductors
multiband superconductivity
ruthenates
superconducting phase transition
unconventional superconductors