Transition to disordered phase and spin dynamics in the two-dimensional ferrimagnetic model.

The effect of transition to disordered phase on AC conductivity in the two-dimensional frustrated ferrimagnetic model in the square lattice at T = 0 is investigated. The spin conductivity, σ reg ( ω ) is determined for different values of frustration parameters J 2 S and J 2 s that separates the different phases such as the ferrimagnetic phase and the collinear phase. We obtain a small influence of this phase transition on spin conductivity. Furthermore, we present the behavior of the half-width of S ( q → , ω ) that gives the information about the scattering of magnons at long wavelength range. [ABSTRACT FROM AUTHOR]