The Phase Transition of the Quantum Spin S=1/2-XXZ Model for a Square Lattice
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概要
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The transverse and longitudinal spin-pair correlations are obtained as a function oftemperature by the second-order Green's function method. The longitudinal N. N.spin-pair correlation at the ground state becomes negative for anisotropy parameter 77between the XY model (77=0) and quite near the Heisenberg model (j - 1.0). It ispredicted from these results that the first-order phase transition occurs near theHeisenberg limit. For 77=0.9, it occurs at a temperature r. restricted by 2.4<r<6.3.
- 社団法人日本物理学会の論文
- 1989-02-15
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