CeLiBi $_2$中交织的非典型量子态
Interwoven atypical quantum states in CeLiBi$_2$
摘要：
我们报告了CeLiBi $_2$的发现，这是四元Ce $TX_2$（$T$ =过渡金属; $X$ =氮族元素）家族中的第一种材料，其中碱金属阳离子取代了典型的过渡金属。磁化率和中子粉末衍射测量是一致的晶体场$Γ_6$基态Kramers双峰，反铁磁低于$T_N = 3.4$ K命令与无公度传播波矢量${\bf{k}} = (0, 0.0724(4), 0.5)$，产生纳米调制的磁结构。有序状态的最佳模型是一个椭圆摆线与Ce矩主要居住在PDMATHAMT平面。这是非常不寻常的，因为所有其他$Γ_6$ Ce $TX_2$成员都是铁磁有序的。此外，我们观察到一个非典型的硬轴变磁过渡在$2$ T的磁致伸缩，磁化强度和电阻率测量。CeLiBi $_2$是一种罕见的高导电材料，具有主导的偏斜散射，导致大的异常霍尔效应。具有五个频率的量子振荡出现在$T = 30$ K和$μ_0H = 55$ T的磁致伸缩和磁化率数据中，这表明有效质量低至0.07 $m_e$的轻载流子的小费米口袋。密度泛函理论计算表明，方网Dirac-like Bi $-p$带负责这些超轻载流子。总之，我们的结果表明CeLiBi $_2$在单一清洁材料中实现了多种非典型的磁性和电子特性。
英文摘要：
We report the discovery of CeLiBi$_2$, the first example of a material in the tetragonal Ce$TX_2$ ($T$ = transition metal; $X$ = pnictogen) family wherein an alkali cation replaces the typical transition metal. Magnetic susceptibility and neutron powder diffraction measurements are consistent with a crystal-field $Γ_6$ ground state Kramers doublet that orders antiferromagnetically below $T_N = 3.4$ K with an incommensurate propagation wave vector ${\bf{k}} = (0, 0.0724(4), 0.5)$ that generates a nanometric modulation of the magnetic structure. The best model of the ordered state is an elliptical cycloid with Ce moments primarily residing in the $ab$ plane. This is highly unusual, as all other $Γ_6$ Ce$TX_2$ members order ferromagnetically. Further, we observe an atypical hard-axis metamagnetic transition at $2$ T in magnetostriction, magnetization, and resistivity measurements. CeLiBi$_2$ is a rare example of a highly conductive material with dominant skew scattering leading to a large anomalous Hall effect. Quantum oscillations with five frequencies arise in magnetostriction and magnetic susceptibility data to $T = 30$ K and $μ_0H = 55$ T, which indicate small Fermi pockets of light carriers with effective masses as low as 0.07$m_e$. Density functional theory calculations indicate that square-net Dirac-like Bi$-p$ bands are responsible for these ultralight carriers. Together, our results show that CeLiBi$_2$ enables multiple atypical magnetic and electronic properties in a single clean material.
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