Superconducting Properties of BaBi${}_3$

Abstract

We report the superconducting properties of single crystals of the intermetallic perovskite-related compound BaBi${}_3$. The superconducting transition temperature ($T_c=5.82$~K) was obtained from heat capacity measurements. Using the measured values for the critical fields $H_{c1},H_{c2}$, and the specific heat $C$, we estimate the thermodynamic critical field $H_c$(0), coherence length $\xi$(0), Debye temperature ${\Theta }_D$ and coupling constant ${\lambda }_{ep}$. $\Delta C/\gamma T_c$ and ${\lambda }_{ep}$ suggest that BaBi${}_3$ is a moderately coupled superconductor and $\gamma$ suggests an enhanced density of states at the Fermi level. Electronic band structure calculations show a complex Fermi surface and a moderately high DOS at the Fermi level. Further analysis of the electronic specific heat shows that the superconducting properties are dominated by s-wave gap.

arXiv comment6 pages, 4 figures, 1 table. arXiv admin note: text overlap with arXiv:1402.4440

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• Ir d-band Derived Superconductivity in the Lanthanum-Iridium System LaIr3
• Pressure-induced multiple phase transformations of the BaBi${}_3$ superconductor
• A Family of Pb-based Superconductors with Variable Cubic to Hexagonal Packing
• Surface symmetry breaking and disorder effects on superconductivity in perovskite BaBi3 epitaxial films
• Systematic global structure search of bismuth-based binary systems under pressure using machine learning potentials
• Superconductivity in spin-orbit coupled BaBi${}_3$ formed by in situ reduction of bismuthate films