Synthesis, structural, and electronic properties of Sr1−xCaxPdAs,Inorganic Chemistry Frontiers

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Synthesis, structural, and electronic properties of Sr1−xCaxPdAs
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-06-16 , DOI: 10.1039/d0qi00284d
Benjamin W. Y. Redemann _{1,

2,

3,

4} , Michael R. Scudder _{1,

2,

3,

4} , Daniel Weber _{1,

2,

3,

4} , Yaxian Wang _{2,

3,

4,

5} , Wolfgang Windl _{2,

3,

4,

5} , Joshua E. Goldberger _{1,

2,

3,

4}

Affiliation

Layered honeycomb intermetallic phases have attracted considerable research interest due to the wide array of exciting physical properties inherent in these materials. Here, we follow the evolution in structure and electronic properties of a relatively unexplored material system, Sr_1−xCa_xPdAs, as the hexagonal PdAs honeycomb layer in SrPdAs distorts into the orthorhombic CaPdAs structure. The Sr-rich compounds (x = 0 to 1/3) form symmetric, hexagonal honeycomb PdAs layers, whereas in the Ca-rich region (x = ½ to 1) the PdAs layers distort into an orthorhombic structure featuring long and short Pd–Pd distances. This distortion occurs when the average Pd–Pd distance falls below 4.21 Å. All compounds are observed to exhibit metallic temperature-dependent resistivity trends. There are no apparent discontinuities indicative of metal-to-insulator transitions and the room temperature resistivity values range from 18 to 180 mΩ cm. In total, this work maps out the structural and electronic phase diagram of Sr_1−xCa_xPdAs compounds.

中文翻译：

Sr1-xCaxPdAs的合成，结构和电子性质

层状蜂窝金属间相由于这些材料固有的一系列令人兴奋的物理特性而吸引了相当多的研究兴趣。在此，我们追踪相对未开发的材料系统Sr _{1- x} Ca _x PdAs在结构和电子性质方面的演变，因为SrPdAs中的六角形PdAs蜂窝层扭曲成正交的CaPdAs结构。富含Sr的化合物（x = 0至1/3）形成对称的六角形蜂窝PdAs层，而在富含Ca的区域（x=½至1）PdAs层变形为具有长和短Pd-Pd距离的正交结构。当平均Pd–Pd距离降至4.21Å以下时，就会发生这种失真。观察到所有化合物均表现出金属温度依赖性电阻率趋势。没有明显的不连续现象表明金属向绝缘体的转变，室温电阻率值范围为18至180mΩcm。总的来说，这项工作勾勒出Sr _{1- x} Ca _x PdAs化合物的结构和电子相图。

更新日期：2020-07-28

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