%0 Journal Article %1 PhysRevMaterials.4.124202 %A Shipunov, G. %A Kovalchuk, I. %A Piening, B. R. %A Labracherie, V. %A Veyrat, A. %A Wolf, D. %A Lubk, A. %A Subakti, S. %A Giraud, R. %A Dufouleur, J. %A Shokri, S. %A Caglieris, F. %A Hess, C. %A Efremov, D. V. %A Büchner, B. %A Aswartham, S. %D 2020 %I American Physical Society %J Phys. Rev. Mater. %K a %N 12 %P 124202 %R 10.1103/PhysRevMaterials.4.124202 %T Polymorphic PtBi$_2$: growth, structure, and superconducting properties %U https://link.aps.org/doi/10.1103/PhysRevMaterials.4.124202 %V 4 %X 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 the noncentrosymmetric $P31m$ space group, and pyrite-type PtBi$_2$ crystallizes in the $Pa3$ space group. A 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 the 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 obtained structure parameters. The calculated density of states shows a minimum for the stoichiometric compound at the Fermi level. These findings warrant further research using a broader array of experimental techniques, as well as on the effect of the substitution on the nontrivial band structure.

@article{PhysRevMaterials.4.124202, abstract = {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 the noncentrosymmetric $P31m$ space group, and pyrite-type PtBi$_2$ crystallizes in the $Pa\bar{3}$ space group. A 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 the 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 obtained structure parameters. The calculated density of states shows a minimum for the stoichiometric compound at the Fermi level. These findings warrant further research using a broader array of experimental techniques, as well as on the effect of the substitution on the nontrivial band structure.}, added-at = {2020-12-28T12:12:53.000+0100}, author = {Shipunov, G. and Kovalchuk, I. and Piening, B. R. and Labracherie, V. and Veyrat, A. and Wolf, D. and Lubk, A. and Subakti, S. and Giraud, R. and Dufouleur, J. and Shokri, S. and Caglieris, F. and Hess, C. and Efremov, D. V. and B\"uchner, B. and Aswartham, S.}, biburl = {https://www.bibsonomy.org/bibtex/28f1fa866782c44da0766a1f59737efae/ctqmat}, day = 3, description = {Phys. Rev. Materials 4, 124202 (2020) - Polymorphic ${\mathrm{PtBi}}_{2}$: Growth, structure, and superconducting properties}, doi = {10.1103/PhysRevMaterials.4.124202}, interhash = {816a64e60889d8842e8e354d34c3e275}, intrahash = {8f1fa866782c44da0766a1f59737efae}, journal = {Phys. Rev. Mater.}, keywords = {a}, month = {12}, number = 12, numpages = {8}, pages = 124202, publisher = {American Physical Society}, timestamp = {2023-10-20T12:52:22.000+0200}, title = {Polymorphic PtBi$_{\mathbf{2}}$: growth, structure, and superconducting properties}, url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.4.124202}, volume = 4, year = 2020 }