Condensed Matter Physics, 2008, vol. 11, No. 3(55), p. 455-462
Effective t-J model of pairing: singlet versus triplet
(Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland)
The t-J model is regarded as a canonical model of spin-singlet pairing induced by the kinetic exchange interaction also responsible for an antiferromagnetic ordering in the strongly correlated narrow-band systems. In the orbitally degenerate systems both ferromagnetic and antiferromagnetic kinetic exchange interactions occur. I briefly review the analogy between the singlet and triplet types of pairing, as well as draw some general conclusions about the pairing induced by these exchange interactions. The general discussion is also illustrated with a concrete case of a two-dimensional lattice with the spin triplet pairing.
t-J model, real space pairing, strong correlations, singlet pairing, triplet pairing, superconductivity
71.10.Fd, 74.20.Mn, 71.27.+a, 74.25.Dw, 74.72.-h