具有与不同磁结构相关的不同磁输运 regime 的高熵形式 $R$Mn$_6$Sn$_6$
A high-entropy form of $R$Mn$_6$Sn$_6$ with distinct magnetotransport regimes correlated to different magnetic structures
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中文总结 AI 辅助
本文制备了含Tb、Dy等6种稀土的高熵$R$Mn$_6$Sn$_6$，观测到其随温度变化的多步磁相变、宽范围各向异性转变与非单调磁阻，关联到稀土竞争导致的自旋调制，展现了稀土调控磁性的潜力。
中文摘要 AI 辅助
kagome结构的$R$Mn$_6$Sn$_6$材料家族作为具有多种磁有序和各向异性的高温金属磁体受到广泛关注。理论研究表明，稀土元素（$R$）决定了给定化合物的磁各向异性方向和磁有序类型，这促使人们研究$R$Mn$_6$Sn$_6$的高熵形式，以探究单晶体中多种稀土元素的相互作用如何导致不同的磁态。本文中，我们采用Tb、Dy、Ho、Er、Tm和Lu的混合稀土，得到了以下相变：在$T_{\text{C}}$=380 K时从顺磁体转变为易平面亚铁磁体（FiM），在$T_{\text{SR1}}$=207 K时转变为FiM易轴态，在$T_{\text{SR2}}$=79 K以下转变为倾斜FiM基态。该行为与之前报道的高熵$R$Mn$_6$Sn$_6$化合物一致，但本文研究的混合稀土独特地表现出从270 K到170 K的易平面到易轴各向异性的宽转变，并揭示了非单调磁阻。利用中子散射数据，我们发现这两种现象都与因稀土相互作用竞争导致的自旋态的非公度调制贡献相关。这种磁阻行为和相关的自旋结构凸显了稀土工程调控磁性的潜力。
英文摘要
The kagome $R$Mn$_6$Sn$_6$ material family has attracted significant attention as high-temperature metallic magnets with a host of different magnetic orderings and anisotropy. Theoretical studies point to the rare-earth ($R$) as the determining factor for both the direction of magnetic anisotropy and the type of magnetic ordering in a given compound. This motivates studying high-entropy forms of $R$Mn$_6$Sn$_6$ to examine how the interplay of several rare-earth elements leads to different magnetic states in a single crystal. Here, we present a rare-earth mix of Tb, Dy, Ho, Er, Tm, and Lu that produces phase transitions from a paramagnet to an easy-plane ferrimagnet (FiM) below $T_{\text{C}}$ = 380 K, then to a FiM easy-axis state at $T_{\text{SR1}}$ = 207 K, to a canted FiM ground state below $T_{\text{SR2}}$ = 79 K. This behavior is consistent with previously reported high-entropy $R$Mn$_6$Sn$_6$ compounds; however, uniquely, the rare-earth mix studied here exhibits a broad transition from easy-plane to easy-axis anisotropy from 270 K to 170 K, and reveals a nonmonotonic magnetoresistance. Using neutron scattering data, we found that both observations correlate with an incommensurate modulated contribution to the spin state due to competing rare-earth interactions. This magnetoresistive behavior and the correlated spin structures underscore the potential for rare-earth engineering of magnetism.
