Thermal Entanglement in the Spin-S Heisenberg XYZ Model

The thermal entanglement in the spin-S Heisenberg XYZ model is studied in detail by using the entanglement measure of negativity. The effects of spin on the thermal entanglement, the threshold temperature, the critical uniform external magnetic field, the nonuniform external magnetic field and the entanglement extremum are discussed, respectively. It is shown that with increasing spin, the entanglement will increase, and then decrease slowly. In addition, we find that entanglement will approach a constant N_c with the increase of DM interaction, the constant increases with the increase of spin, and both the threshold temperature T_c and critical uniform external magnetic field B_c will increase with the increasing spin. Thus high-spin system can inhibit the influence of the external environment better.