Magnetic properties of a mixed spin-1/2 and spin-3/2 Ising model with an uniaxial and biaxial crystal-field potential

TL;DR

This paper investigates the magnetic behavior of a mixed spin-1/2 and spin-3/2 Ising model on a honeycomb lattice, focusing on the effects of crystal-field potentials and spin tunneling phenomena.

Contribution

It provides an exact analysis of the model's thermodynamic and dynamical properties considering uniaxial and biaxial crystal fields, highlighting spin tunneling between specific states.

Findings

Identification of spin tunneling between |±3/2> and |∓1/2> states.

Influence of crystal-field potentials on magnetic phases.

Exact calculation of thermodynamic quantities and autocorrelation functions.

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 the magnetic behaviour of the spin-3/2 atoms. Our results for the basic thermodynamic quantities, as well as the dynamical time-dependent autocorrelation function indicate the spin tunneling between the $| \pm \frac32>$ and $| \mp \frac12>$ states in two different magnetically ordered phases OP$_1$ and OP$_2$, respectively.