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arXiv 2002.03976cond-mat.mtrl-sci
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多晶型PtBi2:生长、结构和超导性能

Polymorphic PtBi2: Growth, structure and superconducting properties

G. Shipunov, I. Kovalchuk, B. R. Piening, V. Labracherie, A. Veyrat, D. Wolf, A. Lubk, S. Subakti, R. Giraud, J. Dufouleur, S. Shokri, F. Caglieris, C. Hess, D.… 展开作者

G. Shipunov, I. Kovalchuk, B. R. Piening, V. Labracherie, A. Veyrat, D. Wolf, A. Lubk, S. Subakti, R. Giraud, J. Dufouleur, S. Shokri, F. Caglieris, C. Hess, D. V. Efremov, B. Büchner, S. Aswartham

摘要:

PtBi $_2$是一个多晶型体系,具有有趣的电子性质。在这里,我们报告了优化的晶体生长和结构表征的黄铁矿型和三方修改的PtBi $_2$。选区电子衍射、X射线粉末衍射和Rietveld精修证实了PtBi $_2$为三角晶系,空间群为非中心对称的$P31m$,黄铁矿型PtBi $_2$为$Pa\bar{3}$空间群。对于三角形PtBi $_2$结构的$x=0, 0.03, 0.35$,获得一系列Pt $_{1-x}$ Rh $_x$ Bi $_2$样品。这些Pt $_{1-x}$ Rh $_x$ Bi $_2$化合物在临界温度从$x=0$的$T_c=600$ mK升高到$x=0.35$的$T_c=2.7$ K时变成超导体。此外,我们计算的电子能带结构,使用所获得的结构参数。计算的态密度(DOS)显示出最小的化学计量的化合物在费米能级。这些发现需要更广泛的实验技术进行进一步的研究,以及取代对非平凡能带结构的影响。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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