A Study on the Temperature Dependence of the Specific Heat near the Curie Temperature of the Heisenberg Ferromagnets

Abstract

Heisenberg 强磁性體의 Curie溫度 附近에서 比熱의 溫度 依存性을 지난 硏究에서 얻은 Green函數 理論에 의하여 硏究하였다. Heisenberg 强磁性體 Spin系에 關한 攝動 Green函數의 運動方程式의 解를 Callen Decoupling 近似方法으로 線型化시켜 求하였고 이 解를 利用하여 Spin의 相關函數를 計算하였다. Spin 相關函數를 利用하여 얻은 Heisenberg 强磁性體의 比熱 溫度依存性이 다른 硏究結果와 一致함을 얻었다.

The temperature dependence of the specific heat above the Curie temperature of the Heisenberg ferromegnets has been studied by use of thermal Green function theory developed in previous work. The spin correlation functions have been calculated from the solutions of the equation of motion of the perturbed Green function of the Heisenberg ferromagnet spin system, after linearizing by the Callen decoupling approximation, And then the specific heat of the Heisenberg ferromagnets was calculated from the spin correlation functions. The temperature dependence of the specific heat was found to be consistent with the other works.

The temperature dependence of the specific heat above the Curie temperature of the Heisenberg ferromegnets has been studied by use of thermal Green function theory developed in previous work. The spin correlation functions have been calculated from the solutions of the equation of motion of the perturbed Green function of the Heisenberg ferromagnet spin system, after linearizing by the Callen decoupling approximation, And then the specific heat of the Heisenberg ferromagnets was calculated from the spin correlation functions. The temperature dependence of the specific heat was found to be consistent with the other works.