1982 年 51 巻 5 号 p. 1412-1414
We have treated the 1-D Heisenberg antiferromagnet in a mean-field theory, and determined a phase diagram showing the regions for the antiferromagnetic state, the spin-Peierls state and the paramagnetic state. When a spin-phonon coupling constant is greater than 1.08, the antiferromagnetic state is stable below a Néel temperature TN=0.568 J⁄kB. When it is less than 1.08, the spin-Peierls state is stable below a transition temperature TP, which is higher than TN and increases as the coupling constant decreases.
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