三维海森伯格模型与Dzyaloshinskii-Moriya相互作用:蒙特卡洛研究
G Albuquerque Silva1, A R Bergeron2, J A Plascak1,2,3
1Departamento de Física, Instituto de Ciências Exatas, <a href="https://ror.org/0176yjw32">Universidade Federal de Minas Gerais</a>, C.P. 702, 30123-970 Belo Horizonte MG, Brazil.
Physical review. E
|July 18, 2024
概括
这项研究使用蒙特卡洛模拟来研究3D海森堡模型与Dzyaloshinskii-Moriya (DM) 相互作用. 结果显示了螺旋的基本状态和二次阶段过渡,证实了尽管DM相互作用,但普遍性很弱.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 统计力学 统计力学
背景情况:
- 经典的海森堡模型描述了材料中的磁相互作用.
- 兹亚洛辛斯基-莫里亚 (DM) 相互作用引入了性,并可能导致复杂的磁性结构.
- 了解磁体系统中的相变对于材料科学至关重要.
研究的目的:
- 为了研究近邻DM相互作用的3D经典海森堡模型的热力学行为.
- 在不同强度的DM相互作用下确定基态和相位过渡特性.
- 在DM相互作用的存在下分析关键指数和普遍性类.
主要方法:
- 蒙特卡洛模拟使用大都会算法.
- 用于热力学分析的单基因图重权重技术.
- 有限尺寸缩放分析以推断到热力学极限.
- 转移边界条件 (SBC) 和波动边界条件 (FBC) 的比较.
主要成果:
- 对于非零的DM相互作用,确定了一个螺旋基态配置.
- 观察到一种常规的二次阶段过渡到一个偏磁状态.
- 过渡温度取决于DM相互作用的大小.
- 临界指数和累积数与纯海森堡模型不同,但比率表明普遍性较弱.
结论:
- 使用DM交互的3D海森堡模型表现出弱的普遍性.
- 在这些模拟中,SBC方法为FBC提供了一个计算效率高的替代方案.
- 该研究提供了洞察力磁相过渡受性相互作用的影响.
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