Spin waves in disordered materials

Spin waves in disordered materials
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无序材料中的自旋波

DOI:
10.1088/1361-648x/aadefb
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发表时间:
2018
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
A. Ernst
A. Ernst
中科院分区:
--
文献类型:
--
作者:
P. Buczek;S. Thomas;A. Marmodoro;N. Buczek;X. Zubizarreta;M. Hoffmann;T. Balashov;W. Wulfhekel;Kh. Zakeri;A. Ernst

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我们提出了一种研究无序材料中自旋波的有效方法。该方法基于海森堡模型,能够计算具有任意种类的无序和杂质浓度的自旋系统中的磁振子性质。在两种互补的方法中考虑了无序效应。在海森堡模型的单位相干势近似下,可以有效地计算置换(非关联)无序系统中的磁子。从计算的角度来看,该方法成本低廉,直接适用于合金和掺杂材料等体系。结果表明,它在所有浓度和波矢上都表现得非常好。另一种方法是使用可能样本的构型平均值直接对大型超级单元格进行数值模拟。这种方法适用于具有任意类型无序的系统。利用密度泛函理论中的自洽格林函数方法,从第一性原理出发,得到了进入海森堡模型的磁矩之间的有效相互作用。因此,我们的方法可以看作是从头算方法,可以用来计算真实材料中的磁子。
We present an efficient methodology to study spin waves in disordered materials. The approach is based on a Heisenberg model and enables calculations of magnon properties in spin systems with disorder of an arbitrary kind and concentration of impurities. Disorder effects are taken into account within two complementary approaches. Magnons in systems with substitutional (uncorrelated) disorder can be efficiently calculated within a single-site coherent potential approximation for the Heisenberg model. From the computation point of view the method is inexpensive and directly applicable to systems like alloys and doped materials. It is shown that it performs exceedingly well across all concentrations and wave vectors. Another way is the direct numerical simulation of large supercells using a configurational average over possible samples. This approach is applicable to systems with an arbitrary kind of disorder. The effective interaction between magnetic moments entering the Heisenberg model can be obtained from first-principles using a self-consistent Green function method within the density functional theory. Thus, our method can be viewed as an ab initio approach and can be used for calculations of magnons in real materials.
无序海森堡铁磁体的广义 CPA 方法
DOI: 10.1088/0022-3719/7/13/013
发表时间: 1974
期刊: Journal of Physics C: Solid State Physics
影响因子: --
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