分子束沉积一种新的Sb畸变方网层状磷属元素化物
Molecular beam deposition of a new layered pnictide with distorted Sb square nets
摘要：
虽然层状磷族元素化物$ABX_2$（$A$：稀土或碱土金属，$B$：过渡金属，$X$：Sb/Bi）家族可以基于Sb/Bi方网承载狄拉克分散体，但是对于$A$和$B$阳离子的可能组合，它们中的近一半尚未被合成。在这里，我们报告的EuCdSb $_{\mathrm{2}}$的制造与最大的$B$ -网站离子半径，这是稳定的薄膜形式的第一次通过分子束沉积。EuCdSb $_{\mathrm{2}}$晶体具有正交$Pnma$结构，在$T_\mathrm{N}=15$ K下表现出反铁磁有序的Eu磁矩.我们的成功生长将是利用薄膜技术进一步探索新型狄拉克材料的重要一步。
英文摘要：
While the family of layered pnictides $ABX_2$ ($A$ : rare or alkaline earth metals, $B$ : transition metals, $X$ : Sb/Bi) can host Dirac dispersions based on Sb/Bi square nets, nearly half of them has not been synthesized yet for possible combinations of the $A$ and $B$ cations. Here we report the fabrication of EuCdSb$_{\mathrm{2}}$ with the largest $B$-site ionic radius, which is stabilized for the first time in thin film form by molecular beam deposition. EuCdSb$_{\mathrm{2}}$ crystallizes in an orthorhombic $Pnma$ structure and exhibits antiferromagnetic ordering of the Eu magnetic moments at $T_\mathrm{N}=15$K. Our successful growth will be an important step for further exploring novel Dirac materials using film techniques.
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