title: Electronic effects in high-energy radiation damage in iron.
abstract: Electronic effects have been shown to be important in high-energy radiation damage processes where a high electronic temperature is expected, yet their effects are not currently understood. Here, we perform molecular dynamics simulations of high-energy collision cascades in α-iron using a coupled two-temperature molecular dynamics (2T-MD) model that incorporates both the effects of electronic stopping and electron-phonon interaction. We subsequently compare it with the model employing electronic stopping only, and find several interesting novel insights. The 2T-MD results in both decreased damage production in the thermal spike and faster relaxation of the damage at short times. Notably, the 2T-MD model gives a similar amount of final damage at longer times, which we interpret to be the result of two competing effects: a smaller amount of short-time damage and a shorter time available for damage recovery.
authors: Queen Mary University of London, Mile End Road, London E1 4NS, UK. South East Physics Network SEPnet, Queen Mary University of London, Mile End Road, London E1 4NS, UK.
authors: E
authors: E
authors: Zarkadoula
authors: S L
authors: SL
authors: Daraszewicz
authors: D M
authors: DM
authors: Duffy
authors: M A
authors: MA
authors: Seaton
authors: I T
authors: IT
authors: Todorov
authors: K
authors: K
authors: Nordlund
authors: M T
authors: MT
authors: Dove
authors: K
authors: K
authors: Trachenko