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Pairing tendencies in a two-orbital Hubbard model in one dimension

Journal Article · · Physical Review B
 [1];  [1];  [2];  [1];  [1]
  1. The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. 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

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Cited By (8)

Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders journal June 2019
Crystal structure determination under high pressure in the iron-based ladder superconductor BaFe 2 S 3 journal August 2018
Magnetic states of iron-based two-leg ladder tellurides journal November 2019
Sequential structural and antiferromagnetic transitions in BaFe 2 Se 3 under pressure journal January 2018
Pairing versus phase coherence of doped holes in distinct quantum spin backgrounds journal March 2018
Excitonic density waves, biexcitons, and orbital-selective pairing in two-orbital correlated chains journal July 2018
Gradual enhancement of stripe-type antiferromagnetism in the spin-ladder material BaFe 2 S 3 under pressure journal November 2018
Fingerprints of an Exotic Orbital-Selective Mott Phase in the Block Magnetic State of BaFe$_2$Se$_3$ Ladders text January 2018

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