High T${}_c$ superconductivity in superhard diamond-like BC${}_5$

Abstract

Using density functional theory calculations we show that the recently-synthesized, superhard diamond-like BC${}_5$ is superconducting with a critical temperature of the same order than that of MgB${}_2$. The average electron-phonon coupling is $\lambda =0.89$, the phonon-frequency logarithmic-average is $<\omega {>}_{\log }=67.4$ meV and the isotope coefficients are $\alpha (C)=0.3$ and $\alpha (B)=0.2$. In BC${}_5$, superconductivity is mostly sustained by vibrations of the B atom and its C neighbors.

4 pages, 3 figures. To appear on Phys. Rev. Lett

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• The Maximum $T_c$ of Conventional Superconductors at Ambient Pressure
• Superhard and Superconducting B6C
• Why Mercury is a superconductor
• Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond
• First-Principles Calculation of Superconducting $T_c$ in Superhard B-C-N Metals