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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
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Cited By

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

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