continuum of compensation temperaturesWe investigate the magnetic properties of the mixed spin-1/2 and spin-1 Ising ferrimagnetic system with four-spin interaction J4 and next-nearest neighbor (NNN) coupling J. We perform exact ground-state calculations and use the finite cluster approximation, ...
Ising model with antiferromagnetic next-nearest-neighbor coupling: spin correlations and disorder points. Phys. Rev. B 1, 4405-4409 (1970)... Stephenson,John - 《Journal of Applied Physics》 被引量: 41发表: 1971年 Three-dimensional Ising model with nearest- and next-nearest-neighbor interaction...
We investigate the topological phase transitions on the square-octagon lattice with an intrinsic spin-orbit coupling and an additional real next-nearest-neighbor hopping. We study the evolution of the band structure under the next-nearest-neighbor hopping parameters. Based on the spin Chern numbers,...
By involving a magnetic field with the Zeeman coupling, the system undergoes two phase transitions; two critical phases with different universality classes are discussed in Ref. 22. The XXZ generalization of the model (2) was defined and investigated in 13,23 . III. CHIRAL-SPIN AND ...
The previously observed transition at around T ~18 K is interpreted as a subtle change in dynamics for a minority of the spins coupling to the muon that we interpret as spins locking into clusters. The dynamics of this fraction of spins freeze below a temperature T_{SF}~8 K, while a ...
It is suggested that two-dimensional antiferromagnets, such as manganese formate dihydrate, may exhibit disorder points.doi:10.1139/p70-266StephensonJohnRevue Canadienne De Physique
next-nearest-neighbor couplingWe study the energy relaxation process in one-dimensional (1D) lattices with next-nearest-neighbor (NNN) couplings. This relaxation is produced by adding damping (absorbing conditions) to the boundary (free-end) of the lattice. Compared to the 1D lattices with on-...
Electron instabilities in the Hubbard model with the next nearest neighbor coupling are calculated by exact diagonalization in finite, two-dimensional Betts cells (lattices). A viable spin and charge coherent pairing, signaled by quantum critical points and a negative charge gap region, is found in...
In this paper we investigate the influence of the next-nearest-neighbor coupling of tight-binding model of graphene on the spectrum of plasmon excitations. The nearest-neighbor tight-binding model was previously used to calculate plasmon spectrum in the next paper [1]. We expand the previous ...
Enhancement of pairing is driven by next nearest neighbor coupling. Optimized criteria for strong charge pairing instability are formulated.doi:10.1016/j.physleta.2011.11.026Kun FangG.W. FernandoA.N. KocharianElsevier B.V.Physics Letters A