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

Val'kov, V. V.; Val'kova, T. A.; Mitskan, V. A. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 440 129-132; Doi: 10.1016/j.jmmm.2016.12.085 OCT 15 2017

Using the diagram technique for the Hubbard operators an integral equation that determines the order parameter of the superconducting phase was obtained in the framework of tJV and tJ*–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.