Magnetism of iron. II
Magnetism of iron. II
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DOI：
10.1103/physrevb.20.4584
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发表时间：
1979-12
影响因子：
3.7
通讯作者：
J. Hubbard
中科院分区：
文献类型：
--
作者：
J. Hubbard
先前开发的基于随机交换场概念的铁磁性理论被修改和扩展。结果表明，库仑场的出现与随机交换场相关；修改允许考虑这些字段，这些字段会改变先前结果的细节而不影响主要结论。该理论已扩展到计算有限温度下模型的属性：计算铁的居里温度 (1840 K)、磁化曲线、顺磁化率（居里-魏斯定律）和有效原子间交换耦合。研究发现，原子自旋矩的大小在居里温度的 1.5 倍以内变化很小。
A previously developed theory of the magnetism of iron, based upon the notion of a randomized exchange field, is modified and extended. It is shown that Coulomb fields arise in association with the randomized exchange field; the modification allows one to take into account these fields, which are found to change the details of the previous results without affecting the main conclusions. The theory has been extended to calculate the properties of the model at finite temperatures: the Curie temperature (1840 K), the magnetization curve, the paramagnetic susceptibility (a Curie-Weiss law), and the effective interatomic exchange coupling are calculated for iron. The magnitudes of the atomic spin moments were found to vary little up to 1.5 times the Curie temperature.