EFFECT OF SPIN FLUCTUATIONS ON ITINERANT ELECTRON ANTIFERROMAGNETISM
EFFECT OF SPIN FLUCTUATIONS ON ITINERANT ELECTRON ANTIFERROMAGNETISM
复制标题
DOI：
10.1143/jpsj.36.1542
复制
发表时间：
1974-01-01
影响因子：
1.7
通讯作者：
MORIYA, T
中科院分区：
文献类型：
--
作者：
HASEGAWA, H;MORIYA, T
通过推广Moriya和Kawabata的流动铁磁性理论，讨论了自旋涨落对流动电子反铁磁性的影响。作为亚晶格磁化强度函数的Hartree-Fock自由能的修正是用横向动力磁化率表示的，它由修正的随机相位近似近似。对具有Umklapp过程的自由电子模型进行了数值计算。结果表明，自旋涨落的贡献在描述流动反铁磁体的磁性方面是非常重要的。当均匀磁化率对温度有较弱的依赖性时，高于该温度的交错磁化率也表现出近似的居里-魏斯行为。
The effect of spin fluctuations on itinerant electron antiferromagnetism is discussed by extending the theory of Moriya and Kawabata for itinerant ferromagnetism. The correction to the Hartree-Fock free energy as a function of the sublattice magnetization is expressed in terms of the transversal dynamical susceptibilities, which are approximated by the modified random phase approximation. Numerical calculations are made for the free electron model with Umklapp processes. It is shown that the contribution from spin fluctuations can be quite important in describing the magnetic properties of itinerant antiferromagnets. The Néel temperature is generally lowered from its Hartree-Fock value and the staggered susceptibility above the Néel temperature shows an approximate Curie-Weiss behavior even when the uniform susceptibility has a weak temperature dependence.