在MnSi中形成一个拓性的非费米液体
1Physik Department E21, Technische Universität München, D-85748 Garching, Germany. robert.ritz@frm2.tum.de
Nature
|May 3, 2013
概括
拓保护的旋转纹理,如 skyrmions,可以导致金属的非费米液态行为. 这项研究表明,即使长距离磁顺序被抑制时,拓的霍尔信号仍然存在,这表明这些纹理驱动了费米液体理论的崩.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
背景情况:
- 费米液体理论成功地描述了金属中的电子行为和排序.
- 拓保护的旋转配置,如和,代表了磁性秩序的独特类别.
- 了解这些复杂的旋转纹理的金属状态是一个关键的研究问题.
研究的目的:
- 在高压下,研究在MnSi中 skyrmion格子边界的金属状态.
- 探索由拓学上非微不足道的旋流组成的磁性秩序的性质.
- 为了确定拓螺旋纹理和非费米液体电阻之间的关系.
主要方法:
- 高压对MnSi.的实验研究.
- 对拓的霍尔信号的测量.
- 在不同温度,压力和磁场下对电阻的分析.
主要成果:
- 斯基米翁网格的特征是拓的霍尔信号,即使在长距离的磁性秩序被压力抑制时,它仍然是强大的.
- 这种拓信号是这种体制中的金属状态的关键特征.
- 拓霍尔信号的温度,压力和磁场范围与非费米液体电阻的扩展区域保持一致.
结论:
- 在拓上非微不足道的旋转相关性可能是费米液体理论在纯金属中的分解的原因.
- 拓式霍尔信号的持久性表明它在金属状态中的基本作用超出了传统的磁性排序.
- 这一发现为理解相关电子系统中新出现的现象开辟了新的途径.
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