$\mu$SR 测量块体 Fe$_3$GeTe$_2$ 晶体中的三维 Ising 铁磁性
$μ$SR measurements of 3D Ising ferromagnetism in bulk Fe$_3$GeTe$_2$ crystals
- Memorial University（纪念大学）
- PSI Center for Neutron and Muon Sciences（瑞士保罗谢尔研究所中子与μ子科学中心）
- Durham University（杜伦大学）
- University of Warwick（华威大学）
- Clarendon Laboratory, Department of Physics, University of Oxford（牛津大学物理系克拉伦登实验室）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文通过磁力测量和 $\mu$SR 数据证明 Fe$_3$GeTe$_2$ 在 2~K 至 220~K 全温区呈现三维 Ising 铁磁性，并指出 170~K 特征实为畴冻结而非反铁磁转变。
AI中文摘要：
Fe$_3$GeTe$_2$ 是一种准二维巡游铁磁体，具有范德瓦尔斯层状结构，表现出显著的磁各向异性。在块体样品中，该材料在 220~K 以下进入磁有序态，而在薄样品中，铁磁矩的栅极可调性引起了广泛关注。除了高温铁磁性外，还存在一种低温磁态，其性质尚未被最终确定，一些研究提出随着温度变化，该材料会在铁磁性和反铁磁性之间发生转变。本文展示了磁力测量和 $\mu$SR 数据，证明 Fe$_3$GeTe$_2$ 在 $T_{C}=220$~K 至 2~K 的整个温度范围内表现出三维 Ising 型铁磁性。先前被提出为向反铁磁性转变的 170~K 特征，实际上可能代表畴冻结转变。
英文摘要：
Fe$_3$GeTe$_2$ is a quasi-two-dimensional itinerant ferromagnet with a van-der-Waals layered structure that exhibits substantial magnetic anisotropy. In bulk samples, this material becomes magnetically ordered below 220~K, while in thin samples, the gate-tunability of the ferromagnetic moment has attracted significant interest. Alongside high-temperature ferromagnetism, a low-temperature magnetic state occurs whose nature has not been conclusively identified, with some studies suggesting a transition between ferromagnetism and antiferromagnetism with temperature. Here we present magnetometry and $μ$SR data that demonstrate that Fe$_3$GeTe$_2$ exhibits three-dimenional Ising-like ferromagnetism over the entire temperature range between $T_{C}=220$~K and 2~K. The feature at 170~K that has previously been proposed to be a transition to antiferromagnetism is instead likely to represent a domain-freezing transition.
