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Magnetic ordering of itinerant systems in modified CPA approximation

机译：修改后的CPA近似中的迭代系统的磁排序

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We will analyze the itinerant model for ferromagnetism with both single-site and two-site electron correlations. We will include band degeneration into the model. This will allow us to consider the on-site exchange interactions in the Hamiltonian. The modified Hartree-Fock approximation for the two-site interactions will be used. This approximation will give the relative one spin band broadening with respect to the other, in addition to the shift in position of majority and minority spin bands. Next, we will use the coherent potential approximation technique (CPA) with two self-energies. One will describe the on-site correlation and the second one the inter-site correlation. We will separate from these self-energies, the linear terms arising from Hartree-Fock approximation which will be applied to both; the on-site and inter-site interactions. These terms will contribute to the effective molecular field and the remaining ones (non-linear) will contribute to the correlation factors. The Green function technique and CPA decoupling will allow for the change in the shape of spin bands, which has been described by the correlation factors and which will decrease the kinetic energy of the system. The gain in kinetic energy due to the on-site and inter-site correlation factors will drive the ferromagnetism and significantly reduce the effective Hartree field necessary to create this ordering. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 28]
机译：我们将分析具有单点和两点电子相关性的铁磁性巡回模型。我们将把带退化纳入模型中。这将使我们能够考虑哈密顿量的现场交换相互作用。将使用两个站点交互的修改后的Hartree-Fock近似值。这种近似将使相对的一个自旋带相对于另一个自旋带变宽，除了多数和少数自旋带的位置偏移之外。接下来，我们将使用具有两个自能量的相干势近似技术（CPA）。一种将描述现场相关性，第二种将描述站点间相关性。我们将从这些自能量中分离出由Hartree-Fock逼近产生的线性项，这将适用于这两种情况;现场和现场之间的互动。这些项将有助于有效的分子场，其余项（非线性）将有助于相关因子。 Green函数技术和CPA去耦将允许自旋带的形状发生变化，这已通过相关因子进行了描述，并且将降低系统的动能。由于现场和现场之间的相关性因素而产生的动能增益将驱动铁磁性，并显着降低产生这种有序性所需的有效哈特里磁场。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：28]

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