Magnetic properties of a mixed spin- and spin- Ising model with an uniaxial and biaxial crystal-field potential

Magnetic properties of a mixed spin- and spin- Ising model on honeycomb lattice are investigated within the framework of an exact star-triangle mapping transformation. The particular attention is focused on the effect of uniaxial and biaxial crystal-field potentials that basically influence a magnetic behavior of the spin- atoms. Our results for basic thermodynamic quantities as well as dynamical time-dependent autocorrelation function indicate a spin tunneling between and states in two different magnetically ordered phases OP1 and OP2, respectively.