The compensation behavior of a mixed spin-2 and spin-5/2 Heisenberg ferrimagnetic system on a honeycomb lattice

The magnetic properties of a mixed spin-2 and spin-5/2 Heisenberg ferrimagnetic system on a layered honeycomb lattice, both of whose sublattices have interlayer interactions and single-ion anisotropy were investigated theoretically by a multisublattice Green-function technique which takes into account the quantum nature of Heisenberg spins. We studied the spin-wave spectra of the ground state. We found three types of the magnetization curves predicted by Neel; in particularly; we investigated the effect of single-ion anisotropies and interlayer interactions on the transition and compensation phenomenon. (C) 2003 Elsevier B.V. All rights reserved.