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Electron-phonon superconductivity and charge density wave instability in the layered titanium-based pnictide BaTi₂Sb₂O · arXivDesk

1210.0499Oct 1, 2012Added the phonon dispersions and electron-phonon coupling for the distorted structure

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

Alaska Subedi

Superconductivity

arXiv PDF

Abstract

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

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I present the results of first principles calculations of the phonon dispersions and electron-phonon coupling for BaTi₂Sb₂O. The phonon dispersions show a weak lattice instability near the zone corners that leads to a charge-density wave phase.

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Researchers working in cond-mat.supr-con and adjacent areas.

Claims

The paper addresses: Electron-phonon superconductivity and charge density wave instability in the layered titanium-based pnictide BaTi₂Sb₂O.
I present the results of first principles calculations of the phonon dispersions and electron-phonon coupling for BaTi₂Sb₂O.

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Author comment: Added the phonon dispersions and electron-phonon coupling for the distorted structure