| Affiliation: | (1) State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083, P.R. China;(2) Institute of Theoretical Physics, Shanxi University, Taiyuan, 030006, P.R. China;(3) Shenfu Dongsheng Coal Limited Company Shenhua Group, Halagou Coal Mine Daliuta Shenmu, Shanxi, 719315, P.R. China;(4) State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100080, P.R. China |
negativity
. It is found that the thermal entanglement is presentand evolvements symmetrically between both ferromagnetic andantiferromagnetic exchange couplings with the temperature. Moreover thecritical temperature at which the negativity vanishes increases with theexchange coupling constant J. From the temperature and magnetic fielddependences we demonstrate that the temperature and the magnetic field canaffect the feature of the thermal entanglement significantly.