Heisenberg Antiferromagnet Using the Green's Function Theory

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概要

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• The second-order Green's function is applied to the discussion of paramagnetic phase of the Heisenberg antiferromagnet. The decoupling parameter is inrtoduced to ensure the self-consistency requirement. High-temperature expansion of the thermodynamic quantities are obtained. The temperature of the minimum inverse susceptibility θ_<min>(k_BT/J)=3.10 is higher than the Neel temperature θ_N=2.08 in the simple-cubic lattice. In the linear and square lattices, there is no finite temperature for the infinite staggered susceptibility, the specific heat has a broad maximum at a finite temperature and the inverse susceptibility is a finite value at zero temperature. The nearest neighbour correlation functions are -0.139 and -0.103 for the linear and square lattices, respectively.

• 理論物理学刊行会の論文
• 1974-05-25

著者

• Fujii Katsuhiko

  Department Of Applied Physics And Applied Mathematics Okayama College Of Science

• Fujii Katsuhiko

  Department Of Applied Physics Okayama College Of Science

• Fujii Katsuhiko

  Department of Applied Physics, Okayama College of Science

• FUJII Katsuhiko

  Department of Agriculture, Yamaguchi University

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