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Pair structure and the pairing interaction in a bilayer Hubbard model for unconventional superconductivity

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1]
  1. ORNL
+ Show Author Affiliations
The bilayer Hubbard model with an intralayer hopping t and an interlayer hopping t{sub {lambda}} provides an interesting testing ground for several aspects of what has been called unconventional superconductivity. One can study the type of pair structures which arise when there are multiple Fermi surfaces. One can also examine the pairing for a system in which the structure of the spin-fluctuation spectral weight can be changed. Using a dynamic cluster quantum Monte Carlo approximation, we find that near half filling, if the splitting between the bonding and antibonding bands t{sub {lambda}}/t is small, the gap has B{sub 1g} (d{sub x{sup 2}-y{sup 2}}-wave) symmetry, but when the splitting becomes larger, A{sub 1g} (s{sup {+-}}-wave) pairing is favored. We also find that in the s{sup {+-}} pairing region, the pairing is driven by interlayer spin fluctuations and that T{sub c} is enhanced.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL); Center for Nanophase Materials Sciences
Sponsoring Organization:
DOE Office of Science; SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1032049
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 84; ISSN 1098-0121
Country of Publication:
United States
Language:
English

References (15)

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BONDING
FERMI LEVEL
FLUCTUATIONS
HUBBARD MODEL
PAIRING INTERACTIONS
SPIN
SUPERCONDUCTIVITY
SYMMETRY
TESTING