Two-dimensional Heisenberg model with spin s=1/2 and antiferromagnetic exchange treated as a spin liquid

被引：0
作者：
E. V. Kuz’min
机构：
[1] Russian Academy of Sciences,Kirensky Institute of Physics, Siberian Division
来源：
Physics of the Solid State | 2002年 / 44卷
关键词：
Spectroscopy; Function Method; Correlation Length; Spin System; Singlet State;
D O I：
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学科分类号：
摘要：
The spin system of the Heisenberg model (s=1/2) on a square lattice with antiferromagnetic (AFM) exchange between nearest neighbors (in which there is no long-range magnetic order at any T≠0) is treated as a spatially homogeneous isotropic spin liquid. The double-time temperature Green’s function method is used in the framework of a second-step decoupling scheme. It is shown that, as T → 0, the spin liquid goes over (without any change in symmetry) to a singlet state with energy (per bond) ɛ0=−0.352 and the correlation length diverges as ξ ∝ T−1 exp(T0/T). The spatial spin correlators oscillate in sign with distance, as in the AFM state. The theory allows one to calculate the main characteristics of the system in all temperature ranges.
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页码：1122 / 1129
页数：7
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