Molecular Spin Dynamics Analysis of Complex Magnetic Structure on the FCC Lattice in Itinerant Electron System
Molecular Spin Dynamics Analysis of Complex Magnetic Structure on the FCC Lattice in Itinerant Electron System
复制标题
流动电子系统FCC晶格复杂磁结构的分子自旋动力学分析
DOI：
10.1016/j.phpro.2015.12.080
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and T. Uchida
中科院分区：
文献类型：
--
作者：
Y. Kakehashi;S. Chandra;and T. Uchida
通过分子自旋动力学（MSD）方法研究了具有竞争磁相互作用的面心立方晶格上哈伯德模型的磁结构。对于库仑相互作用强度 U/|t| = 8，MSD 产生电子数 n 从 2.0 到 1.2 的铁磁性，n 从 1.2 到 0.8 的复杂亚铁磁结构，n = 0.8 到 0.6 之间的复杂反铁磁结构，以及低于 n = 0.60 的顺磁态。利用傅立叶分析发现，当n ≈ 0.90、n ≈ 0.75 和n ≈ 0.70 时，分别实现了具有三Q 波矢的3Q 多重自旋密度波、具有双Q 波矢的2Q 多重自旋密度波和幅度调制的复杂反铁磁结构。
The magnetic structure of the Hubbard model on the fcc lattice with competing magneticinteractions has been investigated by means of the Molecular Spin Dynamics (MSD) method. For the Coulomb interaction strength U/|t| = 8, the MSD yields the ferromagnetism for electron number n from 2.0 to 1.2, complex ferrimagnetic structures for n from 1.2 to 0.8, complex anti- ferromagnetic structures between n = 0.8 and 0.6, and the paramagnetic state below n = 0.60. By making use of the Fourier analysis, it is found that the 3Q multiple spin density waves with triple Q wave vectors, the 2Q multiple spin density waves with double Q wave vectors, and a complex antiferromagnetic structure with amplitude modulation are realized for n ≈ 0.90,n ≈ 0.75, and n ≈ 0.70, respectively.