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

Abstract

Magnetic properties of a mixed spin- 1 2 and spin- 3 2 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- 3 2 atoms. Our results for basic thermodynamic quantities as well as dynamical time-dependent autocorrelation function indicate a spin tunneling between | ± 3 2 〉 and | ∓ 1 2 〉 states in two different magnetically ordered phases OP 1 and OP 2, respectively.