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Title: Magnetic Correlations and Pairing in the 1/5-Depleted Square Lattice Hubbard Model

We study the single-orbital Hubbard model on the 1/5-depleted square-lattice geometry, which arises in such diverse systems as the spin-gap magnetic insulator CaV 4O 9 and ordered-vacancy iron selenides, presenting new issues regarding the origin of both magnetic ordering and superconductivity in these materials. We find a rich phase diagram that includes a plaquette singlet phase, a dimer singlet phase, a Néel and a block-spin antiferromagnetic phase, and stripe phases. Quantum Monte Carlo simulations show that the dominant pairing correlations at half filling change character from d wave in the plaquette phase to extended s wave upon transition to the Néel phase. These findings have intriguing connections to iron-based superconductors, and suggest that some physics of multiorbital systems can be captured by a single-orbital model at different dopings.
Authors:
 [1] ;  [2] ;  [2] ;  [2]
  1. Univ. of California, Davis, CA (United States); San Jose State Univ., San Jose, CA (United States)
  2. Univ. of California, Davis, CA (United States)
Publication Date:
Grant/Contract Number:
NA0001842
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 113; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Univ. of California, Davis, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; depleted lattice; Hubbard model; magnetic correlations
OSTI Identifier:
1343452
Alternate Identifier(s):
OSTI ID: 1344312

Khatemi, Ehsan, Singh, Rajiv R. P., Pickett, Warren E., and Scalettar, Richardq T.. Magnetic Correlations and Pairing in the 1/5-Depleted Square Lattice Hubbard Model. United States: N. p., Web. doi:10.1103/PhysRevLett.113.106402.
Khatemi, Ehsan, Singh, Rajiv R. P., Pickett, Warren E., & Scalettar, Richardq T.. Magnetic Correlations and Pairing in the 1/5-Depleted Square Lattice Hubbard Model. United States. doi:10.1103/PhysRevLett.113.106402.
Khatemi, Ehsan, Singh, Rajiv R. P., Pickett, Warren E., and Scalettar, Richardq T.. 2014. "Magnetic Correlations and Pairing in the 1/5-Depleted Square Lattice Hubbard Model". United States. doi:10.1103/PhysRevLett.113.106402. https://www.osti.gov/servlets/purl/1343452.
@article{osti_1343452,
title = {Magnetic Correlations and Pairing in the 1/5-Depleted Square Lattice Hubbard Model},
author = {Khatemi, Ehsan and Singh, Rajiv R. P. and Pickett, Warren E. and Scalettar, Richardq T.},
abstractNote = {We study the single-orbital Hubbard model on the 1/5-depleted square-lattice geometry, which arises in such diverse systems as the spin-gap magnetic insulator CaV4O9 and ordered-vacancy iron selenides, presenting new issues regarding the origin of both magnetic ordering and superconductivity in these materials. We find a rich phase diagram that includes a plaquette singlet phase, a dimer singlet phase, a Néel and a block-spin antiferromagnetic phase, and stripe phases. Quantum Monte Carlo simulations show that the dominant pairing correlations at half filling change character from d wave in the plaquette phase to extended s wave upon transition to the Néel phase. These findings have intriguing connections to iron-based superconductors, and suggest that some physics of multiorbital systems can be captured by a single-orbital model at different dopings.},
doi = {10.1103/PhysRevLett.113.106402},
journal = {Physical Review Letters},
number = ,
volume = 113,
place = {United States},
year = {2014},
month = {9}
}