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利用自洽的格林函数理论 ,在Heisenberg模型下讨论了二维反铁磁Kagom啨晶格的基态能、静态磁化率和摩尔热容等物理性质 ,得到每个格点的自旋液体基态能Eg/NsJ =- 0 .85 92 ,仅仅比最好的数值模拟结果大 3% .在温度稍低的区域内 ,静态磁化率的倒数随温度升高而增大 ,并且在较高温度时呈线性增加 .在较低温度时 ,摩尔热容随温度增加而增加 ,但在某一温度时 ,它将达到最大值 ,此后随着温度的增加而减小 .这与实验结果符合得很好 ,支持了二维反铁磁Kagom啨晶格Heisenberg模型的基态是没有长程序的结论
The properties of ground state energy, static magnetic susceptibility and molar heat capacity of two-dimensional antiferromagnetic Kagom 啨 lattice are discussed under the Heisenberg model using the self-consistent Green’s function theory. The spin-to-ground state energy Eg / NsJ = - 0.852 2, which is only 3% greater than the best numerical simulation results.In the lower temperature region, the reciprocal of the static magnetic susceptibility increases with increasing temperature and is linear at higher temperatures . At lower temperatures, the molar heat capacity increases with increasing temperature, but it reaches its maximum at a certain temperature and then decreases with increasing temperature, which is in good agreement with the experimental results The ground state of the two-dimensional antiferromagnetic Kagom 啨 lattice Heisenberg model is the conclusion that there is no long program