一个二维的布卢姆-卡佩尔铁磁体在一个振荡磁场的数值模拟与一个恒定的偏差
Celeste Mendes1, Gloria M Buendía1, Per Arne Rikvold2
1Department of Physics, <a href="https://ror.org/01ak5cj98">Universidad Simón Bolívar</a>, Caracas 1080, Venezuela.
Physical review. E
|November 20, 2024
概括
这项研究研究了Blume-Capel运动模型中的超磁性异常. 研究结果显示,这些异常是动力旋转模型的一般特征,而不是以Ising模型为特征.
科学领域:
- 统计力学 统计力学
- 凝聚物质物理学 凝聚物质物理学
- 计算物理 计算物理
背景情况:
- 在动力Ising模型中观察到的超磁性异常表明了复杂的磁性行为.
- 了解这些异常对于描述磁系统中的动态相位过渡至关重要.
研究的目的:
- 为了研究金属磁异常的动力布鲁姆-卡佩尔 (BC) 模型.
- 将动力BC模型的行为与动力Ising模型和平衡模型进行比较.
主要方法:
- 使用热浴蒙特卡洛 (MC) 算法进行数值研究.
- 在旋转±1,0,晶体场和振荡/偏移场的方格格子上进行模拟.
- 敏感性分析和缩放式方差曲线.
主要成果:
- 动 BC 模型在无序 (超临界) 区域呈现超磁性异常,类似于动 Ising 模型.
- 这些异常表现为两种对称的敏感度和缩放方差峰,在平衡模型中不存在.
- 这些异常与单滴和多滴磁化切换机制之间的交叉有关,而不是关键现象.
结论:
- 超磁性异常是动力旋转模型的一般特征,超出了伊斯模型.
- 动态和平衡相转换之间的等价性是有限的,仅在临界点附近有效.
- 与伊辛模型相比,动力BC模型中的零可能会降低接口张力.
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