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在格林函数的理论框架下，采用一维自旋为1的各向异性Heisenberg模型来讨论Y2BaNiO5材料的磁学和热力学性质.得到了它的自旋关联函数、低激发谱、基态能(Eg)、比热(C)和静态磁化率(χ)在不同交换各向异性因子下的性质，所得结果与实验和数值模拟结果完全一致.
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关键词:
- Heisenberg模型 /
- 格林函数理论 /
- Haldane能隙 /
- 反铁磁长程序
In this paper, within the frame of Green's function theory, we study the magnetic and thermodynamic properties of the mixed-spin antiferromagnet Y2BaNiO5 in the spin-1 one-dimensional anisotropic Heisenberg model. We find the correlation function, low-lying excitation, ground-state energy, specific heat and static susceptibility of Y2BaNiO5 for different values of exchange anisotropic parameter γ, and the results are in good agreement with experimental and numerical results.-
Keywords:
- Heisenberg model /
- Green's function theory /
- Haldane gap /
- antiferromagnetic long-range order
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