Abstract
We present theoretical results on the ground state phase diagram, spin waves and dynamic structure factor on the J 1 – J 2 model. In the reasonable physical parameter region corresponding to AFe 1.5Se 2, the A-collinear antiferromagnetic phase is stable. The spin wave spectra have two acoustic branches and four optical branches for this phase on the rhombus-ordered vacancy lattice, and each of them is twofold degenerate. However, they have one nondegenerate acoustic branch and two nondegenerate optical branches on the square-ordered vacancy lattice. To offer the theoretical guidance for the further experiments, we also discuss the magnetic excitation spectra and the inelastic neutron scattering pattern based on linear spin wave theory.
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