Abstract
We use the concept of negativity to study the entanglement of spin-1/2 and spin-5/2 antiferromagnetic Heisenberg model with an inhomogeneous magnetic field. Analytical conclusions of the model are acquired. It is found that the critical temperature \(T_\mathrm{c}\) goes up, as the increase of anisotropy parameter \(k\). The temperature \(T_\mathrm{c}\) becomes bigger than the results of spin-1/2 and spin-3/2 Heisenberg XXZ chain for the same value of \(k\). And we can gain more entanglement at higher temperature by coordinating the value of inhomogeneity \(b\).
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This work is supported by the Scientific Research Program of Jiangxi University of Science and Technology (Grant No. jxxj12160).
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Guo, KT., Xiang, SH., Xu, HY. et al. Thermal entanglement of the mixed spin-1/2 and spin-5/2 Heisenberg model under an external magnetic field. Quantum Inf Process 13, 1511–1521 (2014). https://doi.org/10.1007/s11128-014-0745-7
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DOI: https://doi.org/10.1007/s11128-014-0745-7