Abstract
We present ab initio calculations of the quasiparticle lifetime in cubic transition metals (V, Nb, Ta, Mo, W, Rh, and Ir) performed within the approximation. By analyzing the behavior of the lifetime as a function of the exciting energy, we demonstrate that upon moving along the periods and within the groups of the Periodic table, the changes in -band width, filling, and shape have a strong effect on quasiparticle lifetimes and result in trends fundamentally distinct from those predicted within the homogeneous electron gas model. We show that is mainly determined by the density of states localized in the vicinity of the Fermi level and by the Coulomb interaction screened by electrons. By making use of this partially screened interaction instead of the fully screened one, we estimate quasiparticle lifetimes in with structure and with structure.
- Received 14 September 2007
DOI:https://doi.org/10.1103/PhysRevB.76.245125
©2007 American Physical Society