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Exact diagonalization study of the spin-1 two-dimensional - Heisenberg model on a triangular lattice
P. Rubin, A. Sherman
The spin-1 Heisenberg model on a triangular lattice with the ferromagnetic nearest- and antiferromagnetic third-nearest-neighbor exchange interactions, and ,…
Properties of the half-filled Hubbard model investigated by the strong coupling diagram technique
A. Sherman
The equation for the electron Green's function of the fermionic Hubbard model, derived using the strong coupling diagram technique, is solved self-consistently for the near-neighbo…
The Mott transition in the strong coupling perturbation theory
A. Sherman
Using the strong coupling diagram technique a self-consistent equation for the electron Green's function is derived for the repulsive Hubbard model. Terms of two lowest orders of t…
Magnetic properties of the spin-1 two-dimensional Heisenberg model on a triangular lattice
P. Rubin, A. Sherman, M. Schreiber
Motivated by the recent experiment in NiGaS, the spin-1 Heisenberg model on a triangular lattice with the ferromagnetic nearest- and antiferromagnetic third-nearest-neighbo…