二硫属化物CrNb₃S₆中由Cr插层调控的手性螺旋磁性或铁磁性的出现
An emergence of chiral helimagnetism or ferromagnetism governed by Cr intercalation in a dichalcogenide CrNb$_{3}$S$_{6}$
AI总结：
本文通过系统调控Cr插层量x（0.89–1.03）生长CrₓNb₃S₆单晶，发现x=0.98–1.03的窄区间内出现手性磁孤子晶格行为，最高Tc达133 K，揭示插层量及T位缺陷对磁性质的关键影响。
摘要：
手性二硫属化物TM₃X₆（T：3d过渡金属，M：Nb或Ta，X：S或Se）单晶的合成仍然是研究手性螺旋磁性等新兴量子性质的一个引人关注的问题。在本研究中，我们研究了铬（Cr）插层的手性二硫化物CrₓNb₃S₆单晶中Cr插层量x与磁性质之间的相关性，以优化插层控制单晶的合成条件。包括磁转变温度Tc在内的磁性质因样品不同而取不同值。我们系统地生长了x范围为0.89至1.03的CrₓNb₃S₆单晶，发现Cr插层量x是控制所生长晶体磁性质的关键因素。磁化异常——其在温度依赖性中的出现是手性磁孤子晶格（CSL）形成的证据——仅在x从0.98到1.03的狭窄区域内被观察到。x为0.98和0.99的单晶表现出CSL行为，并具有最高的Tc，为133 K。这些结果表明，T离子位点上的少量缺陷会显著影响TM₃S₆合成中单晶的质量。我们还讨论了合成手性二硫属化物的对映纯单晶的重要性，以便观察手性化合物特有的手性物理性质，例如磁手性效应和手性诱导自旋选择性。
英文摘要：
A synthesis of single crystals of chiral dichalcogenides $TM_{3}X_{6}$ ($T$: 3$d$ transition metal, $M$: Nb or Ta, $X$: S or Se) remains an intriguing issue for the investigation of emergent quantum properties such as chiral helimagnetism. In this study, we investigated a correlation between the quantity of Cr intercalation $x$ and magnetic property in single crystals of a chromium (Cr) intercalated chiral disulfide Cr$_x$Nb$_3$S$_6$ in order to optimize the synthesis condition for the intercalation-controlled single crystals. The magnetic properties including a magnetic transition temperature $T_{c}$ take different values depending on the samples. We systematically grew single crystals of Cr$_{x}$Nb$_{3}$S$_{6}$ with $x$ ranged from 0.89 to 1.03 and found that the amount of the Cr intercalation $x$ is an essential factor in controlling the magnetic properties of the grown crystals. The magnetization anomaly, which appears in the temperature dependence as evidence of the formation of chiral magnetic soliton lattice (CSL), was observed only in a narrow region of $x$ from 0.98 to 1.03. The single crystals with $x$ being 0.98 and 0.99 showed the CSL behavior with the highest $T_{c}$ of 133 K. These results indicate that small amount of defects on the sites for $T$ ions dramatically affects the quality of the single crystals in the synthesis of $TM_{3}$S$_{6}$. We also discuss an importance of synthesizing enantiopure single crystals of chiral dichalgogenides in order to observe chiral physical properties unique to chiral compounds such as magneto-chiral effect and chiral-induced spin selectivity.
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