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本文讨论具有四次幂交换作用的Heisenberg铁磁体,用Малеев玻色变换,在低温区建立〈Siz〉的严格展式,正确地包括了动力学相互作用和运动学相互作用,得到自旋波谱和自发磁化的正确温度依赖关系。We presented here a theory of the Heisenberg ferromagnetic system with biquadratic exchange interaction at, low temperatures. In our theory, the kinematic and dynamic interactions are correctly included. The expansion for Sz in terms of temperature and the temperature dependence of spin wave spectrum are obtained ri-grously.
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