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The triplet superconductivity in square lattices and its optimal doping dependence

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
67
Identifiers
DOI: 10.1016/j.jpcs.2005.10.027
Keywords
  • D. Superconductivity
  • A. Superconductors
Disciplines
  • Physics

Abstract

Abstract In this work, we study the p-wave superconductivity in a square lattice within a Hubbard model, in which a second-neighbour correlated hopping Δ t 3 is included. An infinitesimal distortion of the right angles in the square lattice is considered, which leads to second correlated hoppings Δ t 3± δ 3 in the x ˆ ± y ˆ directions, respectively. This study is carried out by means of the BCS formalism and we found a triplet superconducting ground state even though V=0. The optimal electron density for the critical temperature and the superconducting gap is analyzed as a function of the parameters of the model. Finally, the single-particle excitation gap is also calculated for different electron densities.

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