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. V. Efremov, B. Büchner, and S. Aswartham
Phys. Rev. Materials 4, 124202 – Published 3 December 2020

Abstract

 PtBi2 is a polymorphic system with interesting electronic properties. Here we report optimized crystal growth and structural characterization of pyrite-type and trigonal modification of PtBi2. Selected area electron diffraction, x-ray powder diffraction, and further Rietveld refinement confirms that trigonal PtBi2 crystallizes in the noncentrosymmetric P31m space group, and pyrite-type PtBi2 crystallizes in the Pa3¯ space group. A series of Pt1xRhxBi2 samples was obtained for x=0,0.03,0.35 in the trigonal PtBi2 structure. These Pt1xRhxBi2 compounds become superconducting where the critical temperature increases from Tc=600 mK for x=0 up to Tc=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.

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  • Received 25 February 2020
  • Revised 2 October 2020
  • Accepted 5 November 2020

DOI:https://doi.org/10.1103/PhysRevMaterials.4.124202

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

G. Shipunov1,*, I. Kovalchuk1,2, B. R. Piening1, V. Labracherie1, A. Veyrat1, D. Wolf1, A. Lubk1, S. Subakti1, R. Giraud1,3, J. Dufouleur1, S. Shokri1, F. Caglieris1, C. Hess1, D. V. Efremov1, B. Büchner1,4, and S. Aswartham1,†

  • 1Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany
  • 2Kyiv Academic University, 03142 Kyiv, Ukraine
  • 3Université Grenoble Alpes, CNRS, CEA, Spintec, F-38000 Grenoble, France
  • 4Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany

  • *g.shipunov@ifw-dresden.de
  • s.aswartham@ifw-dresden.de

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Vol. 4, Iss. 12 — December 2020

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