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Applied Physics 2021
Cr5Te8单晶的结构重定和低温拉曼光谱
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Abstract:
本文采用化学气相传输(CVT)法生长了非超晶格Cr5Te8单晶。通过单晶X射线衍射重新确定了晶体结构，弥补了之前这一材料晶体结构来自粉末X射线衍射数据精修的不足。本文中的Cr5Te8属于P3m1空间群，晶胞参数为a = 3.8989 ？，c = 5.9911 ？。X射线能谱(EDS)表明Cr和Te的比例分别为38.5%和61.5%。用四电极法测量的电阻表明，在20 K左右有一个异常趋势。然而，低温下的拉曼光谱直到8 K都没有明显的变化，这表明Cr5Te8在低温下有较高的结构稳定性，即磁性或电学性质都与低温下的晶体结构变化无关。考虑到前人报道的20 K左右的磁性异常，Cr5Te8晶体有望成为一种潜在的磁电耦合材料。
Single crystal Cr5Te8 with basic cell was grown by the chemical vapor transport (CVT) method. The crystal structure was redetermined by single crystal X-ray diffraction. The Cr5Te8 in this work was crystallized in space group P3m1 with a = 3.8989 ？ and c = 5.9911 ？. Typical energy-dispersive X-ray spectra (EDS) suggesting the ratio of Cr and Te is around 38.5% and 61.5%. The electrical resistivity measurements performed on the four types of anodes suggested an abnormal trend around 20 K. However, the Raman spectroscopy at low temperature don’t show any obvious changes until 8 K, which revealing any magnetic or electrical properties are independent of structural changes under low temperature. The Cr5Te8 crystal was expected as a potential magnetoelectric coupling material, considering the magnetic transition around 20 K.
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