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Polymorphic PtBi$_2$ --- candidate for topological superconductivity | | G. Shipunov
; I. Kovalchuk
; B. R. Piening
; V. Labracherie
; A. Veyrat
; J. Dufouleur
; S. Shokri
; F. Caglieris
; C. Heß
; D. V. Efremov
; B. Büchner
; S. Aswartham
; | | Date: |
10 Feb 2020 | | 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$_2$, moreover XRD data analysis
and further Rietveld refinement confirms that trigonal PtBi$_2$ crystallizes in
non-centrosymmetric $P31m$ space group. Furthermore, we calculate the
electronic band structure, using the structure parameters obtained. Series of
Pt$_{1-x}$Rh$_x$Bi$_2$ samples was obtained for $x=0, 0.03, 0.35$ which are
preserving the trigonal PtBi$_2$ structure. Moreover, we find that at low
temperature trigonal-structure Pt$_{1-x}$Rh$_x$Bi$_2$ compounds undergo
superconducting transition. The critical temperature increases from $T_c=600$
mK for $x=0$ up to $T_c=2.7$ K for $x=0.35$. The calculated density of states
(DOS) shows a minimum for the stochiometric compound at the Fermi level. Due to
the topological properties of the electronic band structure material is a
candidate for topological superconductivity. | | Source: | arXiv, 2002.3976 | | Services: | Forum | Review | PDF | Favorites | |
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