Theoretical aspects of the formation and evolution of charged particle tracks

Abstract

The resistivity of a ferromagnetic wire with an extension in contact with a superconductor has been measured at various temperatures and magnetic fields. The distance from the ferromagnet to the superconducting contact was fabricated to be 250-400 nm, much larger than the coherence length in the ferromagnet, which was a few nanometres; nevertheless, we found that the resistivity increases at the superconducting transition. The result was obtained for different ferromagnets and superconductors. We establish that the resistivity increase is not due to a redistribution of magnetic domains as a result of the screening of magnetic flux by the superconductor, as suggested recently.

Electron–lattice coupling after high-energy deposition in aluminum

“…High energy deposition into a solid by swift heavy ions decelerated in the electronic stopping regime (SHI, M > 20 m p , E > 1 MeV/amu, m p is a proton mass) allows to achieve extreme levels of excitation of its electron subsystem. The temperature of the electron ensemble can rise up to several Fermi energies in the nanometric vicinity of the ion trajectory (SHI track) at the femto-to pico-second timescale after an ion passage [1,2]. Similar levels of electronic excitations are reached on the micrometer scale during irradiations of solids with femtosecond free-electron lasers (FEL) [3][4][5][6].…”

“…Similar levels of electronic excitations are reached on the micrometer scale during irradiations of solids with femtosecond free-electron lasers (FEL) [3][4][5][6]. Subsequent relaxations of the excited electron subsystem results in energy and momentum transfer into the lattice that may lead to unusual nanometric structural and phase transformations in an irradiated material [1][2][3][4][5][6].…”

Strongly Coupled Nonequilibrium Nanoplasma Generated by a Fast Single Ion in Solids

“…In contrast to p L (0), the plasma temperature increases significantly with projectile ion slowing down to ∼ 3 MeV/amu -from 14 to 25 eV for silicon excited by Ni(58) projectiles, and from 25 to 40 eV for aluminum excited by Mg (26) projectiles. This effect illustrates the fact that the linear energy loss of the projectile ion is increasing along with the stopping process from 11 to 3 MeV/amu [23,25].…”

Effects of model approximations for electron, hole, and photon transport in swift heavy ion tracks

“…DSF describes the collective response of a target to excitation. For scattering of charged particles, the DSF can be expressed in terms of the loss function of a target (imaginary part of the Complex Dielectric Function (CDF), ε(ω,q)) via the fluctuation-dissipation theorem [13][14][15]. This results in the following form of the differential cross section, σ, of a charged particle interacting with a coupled system of charged scattering centers in the isotropic case assumed within MC models:…”

“…In particular, within the first Born approximation (the first order of the perturbation theory of the kinetic energy of a projectile), effects of collective response of a condensed target can be taken into consideration expressing the scattering cross sections in terms of the Dynamic Structure Factor (DSF) [12]. The fluctuation-dissipation theorem links the DSF to the Complex Dielectric Function (CDF) of a material [13][14][15].…”