The phononic and charge density wave behavior of entire rare-earth tritelluride series with chemical pressure and temperature
The phononic and charge density wave behavior of entire rare-earth tritelluride series with chemical pressure and temperature
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DOI：
10.1063/5.0110395
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发表时间：
2022-11
期刊：
影响因子：
6.1
通讯作者：
K. Yumigeta;Y. Attarde;J. Kopaczek;M. Sayyad;Yuxia Shen;Mark Blei;Seyed Tohid Rajaei Moosavy;Ying Qin;R. Sailus;S. Tongay
中科院分区：
文献类型：
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作者：
K. Yumigeta;Y. Attarde;J. Kopaczek;M. Sayyad;Yuxia Shen;Mark Blei;Seyed Tohid Rajaei Moosavy;Ying Qin;R. Sailus;S. Tongay
在这里，我们通过温度依赖性角分辨拉曼光谱测量，展示了稀土范德华三碲化物的综合声子和电荷密度波特性（CDW）。所有可能的稀土三碲化物 (RTe3) 范围从 R = La-Nd、Sm、Gd-Tm 均通过化学气相传输技术合成，以获得具有优异 CDW 特性的高质量晶体。拉曼光谱研究成功识别了 CDW 状态和转变温度 (TCDW) 的出现，这提供了一种无损方法来识别具有微米空间分辨率的 CDW 响应。温度相关的拉曼测量进一步关联了金属阳离子的原子质量和由此产生的化学压力如何影响其 CDW 特性，并提供了对 CDW 跃迁期间 CDW 振幅模式-声子耦合强度的详细了解。角度分辨拉曼测量通过监测 CDW 跃迁中声子模式对称性的变化，首次洞察 CDW-声子对称性相互作用。总体结果介绍了 RTe3 CDW 材料库，并通过无损角分辨拉曼光谱技术确定了其特性。
Here, we present comprehensive phononic and charge density wave properties (CDW) of rare-earth van der Waals tritellurides through temperature dependent angle-resolved Raman spectroscopy measurements. All the possible rare-earth tritellurides (RTe3) ranging from R = La–Nd, Sm, Gd–Tm were synthesized through a chemical vapor transport technique to achieve high quality crystals with excellent CDW characteristics. Raman spectroscopy studies successfully identify the emergence of the CDW state and transition temperature (TCDW), which offers a non-destructive method to identify their CDW response with micron spatial resolution. Temperature dependent Raman measurements further correlate how the atomic mass of metal cations and the resulting chemical pressure influence its CDW properties and offer detailed insight into the strength of CDW amplitude mode-phonon coupling during the CDW transition. Angle-resolved Raman measurements offer the first insights into the CDW-phonon symmetry interplay by monitoring the change in the symmetry of phonon mode across the CDW transition. Overall results introduce the library of RTe3 CDW materials and establish their characteristics through the non-destructive angle-resolved Raman spectroscopy technique.