Structure and composition tunable superconductivity, band topology and elastic response of hard binary niobium nitrides Nb${}_2$N, Nb${}_4$N${}_3$ and Nb${}_4$N${}_5$

K. Ramesh Babu, Guang-Yu Guo

We perform a systematic \textit{ab initio} density functional study of the superconductivity, electronic and phononic band structures, electron-phonon coupling and elastic constant…