Superconductivity in the extended Hubbard model with more than nearest-neighbour contributions

Zsolt Szabó, Z. Gulácsi

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5 Citations (Scopus)

Abstract

Superconducting phase diagram of the extended Hubbard model supplemented with interaction and hopping terms exceeding the nearest-neighbour distance in range is analysed systematically at different band filling and temperature values in a mean-field approximation. The obtained results clearly emphasize the importance of next-nearest-neighbour terms in developing the main superconducting phases of different symmetries at a given point of the phase diagram; in particular, critical temperatures Tc, zero temperature gap amplitude values Δ0, Δ0/Tc ratios, doping and temperature dependences are all strongly influenced by next-nearest-neighbour contributions.

Original languageEnglish
Pages (from-to)911-928
Number of pages18
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Volume76
Issue number6
Publication statusPublished - Dec 1997

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Hubbard model
Superconductivity
superconductivity
phase diagrams
Phase diagrams
critical temperature
Temperature
temperature dependence
temperature
symmetry
approximation
Doping (additives)
interactions

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "Superconducting phase diagram of the extended Hubbard model supplemented with interaction and hopping terms exceeding the nearest-neighbour distance in range is analysed systematically at different band filling and temperature values in a mean-field approximation. The obtained results clearly emphasize the importance of next-nearest-neighbour terms in developing the main superconducting phases of different symmetries at a given point of the phase diagram; in particular, critical temperatures Tc, zero temperature gap amplitude values Δ0, Δ0/Tc ratios, doping and temperature dependences are all strongly influenced by next-nearest-neighbour contributions.",
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AB - Superconducting phase diagram of the extended Hubbard model supplemented with interaction and hopping terms exceeding the nearest-neighbour distance in range is analysed systematically at different band filling and temperature values in a mean-field approximation. The obtained results clearly emphasize the importance of next-nearest-neighbour terms in developing the main superconducting phases of different symmetries at a given point of the phase diagram; in particular, critical temperatures Tc, zero temperature gap amplitude values Δ0, Δ0/Tc ratios, doping and temperature dependences are all strongly influenced by next-nearest-neighbour contributions.

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