Charge Density Waves in the Rare Earth Polychalcogenides

本文提出的工作的中心目标是描述层状稀土多硫属化合物中电荷密度波（CDWs）的存在和稳定性。该方法将合成的固态化学成分与晶体结构、电输运和磁化率的物理测量相结合，并对CDW相中观察到的和预测的结构畸变进行理论分析。通过改变温度、压力、组成和化学计量，可以连续地控制这种几乎同结构化合物家族的总电子数和共价，从而达到CDW稳定性的完整范围。核心兴趣是鉴定和描述CDW是边缘稳定的化合物，因为在这里负责CDW不稳定的潜在力量是最容易识别的，最终可以用来预测新的CDW材料类别。＊＊＊

9319196 Aronson The central objective of the proposed work is to delineate the occurrence and stability of Charge Density Waves (CDWs) in the layered rare earth polychalcogenides. This approach combines a synthetic solid-state chemistry component with physical measurements of crystal structure, electrical transport, and magnetic susceptibility and theoretical analyses of observed and predicted structural distortions in the CDW phase. By varying temperature, pressure, composition, and stoichiometry, the overall electron count and covalency in this nearly isostructural family of compounds can be controlled in a continuous manner, accessing the complete range of CDW stability. Of central interest is the identification and description of compounds in which the CDW is marginally stable, for here the underlying forces responsible for the CDW instability are most readily identified and ultimately can be used to predict new classes of CDW materials. ***