Polymorphic PtBi2: Growth, structure and superconducting properties

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 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.

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Cited by in corpus (28)

• Superconducting Arcs
• Two-dimensional Topological Ferroelectric Metal with Giant Shift Current
• Berezinskii-Kosterlitz-Thouless transition in the type-I Weyl semimetal PtBi${}_2$
• Surface superconductivity in the topological Weyl semimetal t-PtBi${}_2$
• Giant Inverse Rashba-Edelstein Effect: Application to Monolayer OsBi${}_2$
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Electronic structure of the surface superconducting Weyl semimetal PtBi${}_2$
• Intrinsic surface superconducting instability in Type-I Weyl Semimetals
• Sixfold fermion near the Fermi level in cubic PtBi2
• Fermi arcs dominating the electronic surface properties of trigonal PtBi${}_2$
• Enhanced weak superconductivity in trigonal $\gamma$-PtBi${}_2$
• Chiral Meissner effect in time-reversal invariant Weyl superconductors
• Superconductivity in Two-Dimensional Systems with Unconventional Rashba Bands
• Self-consistent surface superconductivity in time-reversal symmetric Weyl semimetals
• Phonon-mediated intrinsic topological superconductivity in Fermi arcs
• Electron dynamics in a three-dimensional Brillouin zone analysed by machine learning
• Topological nodal $i$-wave superconductivity in PtBi${}_2$
• Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi${}_2$
• Experimental detection of topological electronic state and large linear magnetoresistance in $SrS{n}_4$ superconductor
• Investigation on high-order planar Hall effect in trigonal PtBi${}_2$
• Ginzburg-Landau theory for unconventional surface superconductivity in PtBi${}_2$
• Interplay between inversion and translation symmetries in trigonal PtBi${}_2$
• Dissipationless transport signature of topological nodal lines
• Atomic Visualization of Bulk and Surface Superconductivity in Weyl Semimetal γ-PtBi2
• Gapless Topological Peierls-like instabilities in more than one dimension
• Observation of two-level critical-state in a van-der-Waals superconductor Pt(Bi${}_{1-x}$Se${}_x$)${}_2$
• Higher-order topological superconductivity in type-II time-reversal-symmetric Weyl semimetals with a hybrid pairing
• Mechanism for Nodal Topological Superconductivity on PtBi${}_2$ Surface