title: Lifetimes of excited electrons in Fe and Ni: first-principles GW and the T-matrix theory.
abstract: We present the results of an ab initio calculation of excited electron lifetimes in ferromagnetic materials which incorporates non-spin-flip and spin-flip processes within GW and T-matrix approaches. The method we develop is applied to low-energy electron excitations in Fe and Ni. It is found that the spin-wave generation in Fe essentially reduces the lifetimes of the spin-minority d states whereas the free-electron-like spin-minority states and all the spin-majority states are affected much less. The influence of spin-flip scattering on the lifetimes in Ni appears to be weak. The T-matrix non-spin-flip processes are important for the lifetimes of excited spin-minority states.
authors.affiliation: Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain.
authors.forename: V P
authors.initials: VP
authors.lastname: Zhukov
authors.forename: E V
authors.initials: EV
authors.lastname: Chulkov
authors.forename: P M
authors.initials: PM
authors.lastname: Echenique