Abstract
The spin-1/2 anisotropic Heisenberg model is studied by generalizing the Migdal-Kadanoff renormalization transformations to quantum spin systems. An approximate one-dimensional decimation is employed besides the potential-moving approximation in this generalization. It is shown that these approximations are valid at high temperatures. The results obtained from these approximations suggest that the two-dimensional spin-1/2X-Y model shows the critical behavior similar to that expected for the classicalX-Y and planar models.
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Takano, H., Suzuki, M. Migdal-Kadanoff renormalization group approach to the spin-1/2 anisotropic Heisenberg model. J Stat Phys 26, 635–663 (1981). https://doi.org/10.1007/BF01010931
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DOI: https://doi.org/10.1007/BF01010931