论文标题
在Weyl Semimetal CO3SN2S2的磁性阶段中阐明特殊过渡的起源
Unravelling the origin of the peculiar transition in the magnetically ordered phase of the Weyl semimetal Co3Sn2S2
论文作者
论文摘要
CO3SN2S2中拓扑非平地行为的最新发现激发了对这款流动的铁磁铁（TC = 174 K）的显着兴趣。确切的磁态仍然模棱两可，其中有几份报告表明在125-130 K范围内存在第二个过渡，并提出了抗铁磁和玻璃相的抗铁磁相与铁磁相共存。使用详细的角度依赖性直流和AC磁化测量在大型高质量的单晶上，我们揭示了CO3SN2S2的静态和动态响应的高度各向异性行为。已经确定，当b ||时，许多与急剧磁化有关的观察结果会发生变化。 C受样品的消灭因子的影响。另一方面，在TP = 128 K处发现了真正的过渡，磁反应严格垂直于C轴，并且比B ||小的几个数量级。 c。使用密度功能理论的计算表明，基态磁性结构由远离C轴的磁矩组成，小角度（〜1.5维）。我们认为，第二个过渡起源于kagome平面内的一小部分矩，每个自旋的等效方向。
Recent discovery of topologically non-trivial behavior in Co3Sn2S2 stimulated a notable interest in this itinerant ferromagnet (Tc = 174 K). The exact magnetic state remains ambiguous, with several reports indicating the existence of a second transition in the range 125 -- 130 K, with antiferromagnetic and glassy phases proposed to coexist with the ferromagnetic phase. Using detailed angle-dependent DC and AC magnetization measurements on large, high-quality single crystals we reveal a highly anisotropic behavior of both static and dynamic response of Co3Sn2S2. It is established that many observations related to sharp magnetization changes when B || c are influenced by the demagnetization factor of a sample. On the other hand, a genuine transition has been found at Tp = 128 K, with the magnetic response being strictly perpendicular to the c-axis and several orders of magnitude smaller than for B || c. Calculations using density-functional theory indicate that the ground state magnetic structure consist of magnetic moments canted away from the c-axis by a small angle (~ 1.5deg). We argue that the second transition originates from a small additional canting of moments within the kagome plane, with two equivalent orientations for each spin.
