Effect of the three-center terms on the chiral superconducting d-wave pairing of the Hubbard fermions on the triangular lattice

• Published in: Journal of magnetism and magnetic materials Vol. 440; pp. 129 - 132
• Main Authors: Val'kov, V.V., Val'kova, T.A., Mitskan, V.A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.10.2017; Elsevier BV
• Subjects: Carrier density; Chiral order parameter; Fermions; Integral equations; Operators (mathematics); Order parameters; Superconductivity; Triangular lattice; Chiral order parameter; Triangular lattice; Superconductivity
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2016.12.085

Using the diagram technique for the Hubbard operators an integral equation that determines the order parameter of the superconducting phase Δ(p) was obtained in the framework of t–J–V and t–J*–V models on triangular lattice. It is shown that there are two scenarios of formation of superconducting phase with gapless spectrum at the critical concentration of carriers xc. The effect of three-center terms on implementation of this phase was also considered. •The conditions for the implementation of the d + id superconducting phase with gapless spectrum are found.•It is shown that there are two different scenarios for the formation of the superconducting phase with gapless spectrum.•The effect of the three-center interactions on the formation of the superconducting phase with gapless spectrum is studied.