Magnetic and thermodynamic properties of the mixed-spin antiferromagnet Y2BaNiO5

Kong Hong-Yan; Zhang Lin; Song Yun

doi:10.7498/aps.55.4865

Abstract
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
Authors and contacts
Kong Hong-Yan¹,

Zhang Lin¹,

Song Yun²

(1)宝鸡文理学院物理系非线性物理研究所，宝鸡 721007; (2)北京师范大学物理系，北京 100875
References

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Vol. 55, Issue 9 - 2006-05-05

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Magnetic and thermodynamic properties of the mixed-spin antiferromagnet Y2BaNiO5

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Magnetic and thermodynamic properties of the mixed-spin antiferromagnet Y2BaNiO5

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