Spin transport in the frustrated anisotropic two-dimensional ferromagnet in the square lattice. (August 2016)

• Record Type: Journal Article
• Authors: Lima, L.S.
• Is Part Of: Solid state communications. Volume 240(2016)
• Page Start: 28
• Page End: 32
• Publication Date: 2016-08
• Subjects: Spin transport -- Two-dimensional -- Frustrated spin systems; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2016.04.010
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We use the SU(3) Schwinger boson formalism together with the Kubo theory of the linear response to study the spin transport in the two-dimensional S =1 frustrated anisotropic Heisenberg ferromagnet in a square lattice with easy-plane single-ion anisotropy and considering the second-neighbor interaction in the diagonal and the third-neighbor interaction ( J 1 – J 2 – J 3 model). The AC spin conductivity σ reg ( ω ) is determined for several values of the critical single-ion parameter D, and the frustration parameters J 2 and J 3 . We have calculated the dynamic structure factor too, S ( q →, ω ), for this model and obtained a behaviour exponentially decreasing for the damping Γ q with the decreasing of q = | q → | towards q → 0 . Abstract : Highlights: We study the spin transport of the model at T =0 with objective to verify the influence of the parameters of frustration η and λ in the spin conductivity. We consider the anisotropy parameter Δ = 1 → The phase diagram of the model presents a quantum phase transition in the points η 1 C and η 2 C → These points have an influence in the height of the spin conductivity σ reg ( ω ) → We calculate the dynamic structure factor S ( q, ω ) for different values of wave vector q . The parameters of frustration generate a bit influence on the spin conductivity and in the S ( q, ω ) .