Pairing tendencies in a two-orbital Hubbard model in one dimension
Journal Article
·
· Physical Review B
- The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
The recent discovery of superconductivity under high pressure in the ladder compound BaFe2S3 has opened a new field of research in iron-based superconductors with focus on quasi-one-dimensional geometries. In this publication, using the density matrix renormalization group technique, we study a two-orbital Hubbard model defined in one-dimensional chains. Our main result is the presence of hole binding tendencies at intermediate Hubbard U repulsion and robust Hund coupling JH / U = 0.25. Binding does not occur either in weak coupling or at very strong coupling. The pair-pair correlations that are dominant near half-filling, or of similar strength as the charge and spin correlation channels, involve hole-pair operators that are spin singlets, use nearest-neighbor sites, and employ different orbitals for each hole. As a result, the Hund coupling strength, presence of robust magnetic moments, and antiferromagnetic correlations among them are important for the binding tendencies found here.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1399230
- Alternate ID(s):
- OSTI ID: 1373431
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 96; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Coexistence of Pairing Tendencies and Ferromagnetism in a Doped Two-Orbital Hubbard Model on Two-Leg Ladders
Luther-Emery liquid and dominant singlet superconductivity in the hole-doped Haldane spin-1 chain
Journal Article
·
Thu Dec 31 23:00:00 EST 2009
· Physical Review B
·
OSTI ID:979320
Luther-Emery liquid and dominant singlet superconductivity in the hole-doped Haldane spin-1 chain
Journal Article
·
Sun Aug 25 20:00:00 EDT 2024
· Physical Review. B
·
OSTI ID:2474747