论文标题
多态性PTBI2：生长，结构和超导特性
Polymorphic PtBi2: Growth, structure and superconducting properties
论文作者
论文摘要
PTBI $ _2 $是具有有趣的电子属性的多态性系统。在这里，我们报告了ptbi $ _2 $的黄铁矿型和三角形修饰的优化晶体生长和结构表征。选定的区域电子衍射，X射线粉末衍射和进一步的Rietveld精炼证实，三角ptbi $ _2 $在非中心对称性$ ptbi type ptbi ptbi ptbi $ _2 $ _2 $ in $ pa in $ pa \ bar {3} $ space群中结晶。 PT $ _ {1-X} $ RH $ _X $ bi $ _2 $样品的系列以$ x = 0，0.03，0.35 $在Trigonal Ptbi $ _2 $结构中获得。这些pt $ _ {1-x} $ rh $ _x $ bi $ _2 $化合物成为超导，其中关键温度从$ t_c = 600 $ mk升高，$ x = 0 $ x = 0 $ t_c = 2.7 $ k for $ x = 0.35 $。此外，我们使用获得的结构参数来计算电子带结构。计算的状态密度（DOS）显示了费米水平的静态计量化合物的最小值。这些发现值得通过更广泛的实验技术进行进一步的研究，以及替代对非平凡带结构的影响。
PtBi$_2$ is a polymorphic system with interesting electronic properties. Here we report optimized crystal growth and structural characterization of pyrite-type and trigonal modification of PtBi$_2$. Selected area electron diffraction, X-ray powder diffraction and further Rietveld refinement confirms that trigonal PtBi$_2$ crystallizes in non-centrosymmetric $P31m$ space group, pyrite-type PtBi$_2$ in $Pa\bar{3}$ space group. Series of Pt$_{1-x}$Rh$_x$Bi$_2$ samples was obtained for $x=0, 0.03, 0.35$ in the trigonal PtBi$_2$ structure. These Pt$_{1-x}$Rh$_x$Bi$_2$ compounds become superconducting where critical temperature increases from $T_c=600$ mK for $x=0$ up to $T_c=2.7$ K for $x=0.35$. Furthermore we calculate the electronic band structure, using the structure parameters obtained. The calculated density of states (DOS) shows a minimum for the stochiometric compound at the Fermi level. These findings warrant further research by broader array of experimental techniques, as well as the effect of the substitution on the non-trivial band structure.
