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I present the results of first principles calculations of the phonondispersions and electron-phonon coupling for BaTi$_2$Sb$_2$O. The phonondispersions show a weak lattice instability near the zone corners that leads toa charge-density wave phase. The calculations of the electron-phonon couplingreveal strong coupling, especially to the in-plane Ti modes. The total couplingis large enough to readily explain the superconductivity in this compound. Asthe Fermi surfaces are disconnected with different orbital character weights,this compound is likely to host a multiband superconductivity.

Electron-phonon superconductivity and charge density wave instability in the layered titanium-based pnictide BaTi$_2$Sb$_2$O