- 作者： 周東川; 陳信雄
- 作者服務機構： 國立清華大學
- 中文摘要： 以高溫度級數求自旋為1/2各方異性海增白模型之序列參數(order parameter)之四階起伏(fourth-order fluctuation)至T-6，分析這些級數我們估計出平面三角晶格之相變溫度。雖然此估計之誤差在各方同性之鄰近較大，本分析顯示自旋為1/2之各方異性海增白模型在平面晶格中有鐵磁相變存在。
- 英文摘要： Exact high temperature series expansions to order T-6 are derived forthe fourth-order fluctuations in the order parameters for the spin一1/2aniso-tropic Heisenberg ferromagnet. These series are analysed to give theferromagnetic critical temperatures for the triangular lattice. Althoughuncertainties in the estimates are large in the isotropic region, there isevidence in favor of phase transitions in the spin一1/2 two-dimensionalanisotropic Heisenberg ferromagnets for all values of the anisotropy.
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