Green's Function Theory of the Two-Dimensional Heisenberg Model : Spin Wave in Short Range Order
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概要
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The two dimensional Heisenberg model is studied with a Green's function decoupl-ing scheme in the ferromagnetic and the antiferromagnetic cases. We employ Kondoand Yamaji's formulation and improve it quantitatively. The present theory does notviolate the rotational symmetry and the sum rule of the correlation function. Wecalculate excitation spectrum, long range order, correlation functions, correlationlength, energy, and spin susceptibility. The results are compared with those of theMonte Carlo simulations and the experiments of La.Cu0.. Qualitative and semi-quantitative agreements are obtained. In particular, the temperature dependence ofthe susceptibility indicated by Monte Carlo simulations is reproduced over all temper-ature region.
- 社団法人日本物理学会の論文
- 1991-07-15
著者
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TAKADA Satoshi
Institute of Physics,University of Tsukuba
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Shimahara Hiroshi
Faculty Of Integrated Arts And Sciences Hiroshima University
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Takada Satoshi
Institute Of Physics University Of Tsukuba
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Takada Satoshi
Institute For Solid States Physics University Of Tokyo : Department Of Physics College Of General Education University Of Tokyo
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