可果美金属Co_3Sn_2-xIn_xS_2中的螺旋磁相
Putative helimagnetic phase in the kagome metal Co_3Sn_2-xIn_xS_2
摘要：
对强电子相关性产生的拓扑电子相的探索是凝聚态物理的前沿领域。目前作为此类研究平台出现的一类系统是基于过渡金属的所谓戈薇磁体。利用μ子自旋-旋转，我们探索了可果美磁体Co $_{3}$ Sn $_{2-x}$ In $_{x}$ S $_{2}$中的磁关联作为In掺杂的函数，为有趣的无公度螺旋磁（HM）态提供了推定的证据。我们的研究结果表明，而未掺杂的样品表现出的面外铁磁（FM）的基态，在5 ${\%}$的In掺杂的系统进入一个状态，其中FM和面内反铁磁（AFM）相共存。在更高的掺杂下，HM状态出现并且在仅为$x_{\rm cr,1}$ ${\simeq}$ 0.3的临界掺杂水平下成为主导。这表明从FM通过混合态到$x_{\rm cr,1}$的螺旋相的零温度一阶量子相变。此外，在$x_{\rm cr,2}$ ${\simeq}$ 1处，观察到从螺旋相到顺磁相的零温度二级相变，证明了拓扑磁体Co $_{3}$ Sn $_{2-x}$ In $_{x}$ S $_{2}$的相图中的HM量子临界点（QCP）。所观察到的磁性戈薇晶格中的相互作用的多样性驱动该系统的拓扑霍尔响应的非单调变化。
英文摘要：
The exploration of topological electronic phases that result from strong electronic correlations is a frontier in condensed matter physics. One class of systems that is currently emerging as a platform for such studies are so-called kagome magnets based on transition metals. Using muon spin-rotation, we explore magnetic correlations in the kagome magnet Co$_{3}$Sn$_{2-x}$In$_{x}$S$_{2}$ as a function of In-doping, providing putative evidence for an intriguing incommensurate helimagnetic (HM) state. Our results show that, while the undoped sample exhibits an out-of-plane ferromagnetic (FM) ground state, at 5 ${\%}$ of In-doping the system enters a state in which FM and in-plane antiferromagnetic (AFM) phases coexist. At higher doping, a HM state emerges and becomes dominant at the critical doping level of only $x_{\rm cr,1}$ ${\simeq}$ 0.3. This indicates a zero temperature first order quantum phase transition from the FM, through a mixed state, to a helical phase at $x_{\rm cr,1}$. In addition, at $x_{\rm cr,2}$ ${\simeq}$ 1, a zero temperature second order phase transition from helical to paramagnetic phase is observed, evidencing a HM quantum critical point (QCP) in the phase diagram of the topological magnet Co$_{3}$Sn$_{2-x}$In$_{x}$S$_{2}$. The observed diversity of interactions in the magnetic kagome lattice drives non-monotonous variations of the topological Hall response of this system.
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