  Vortex dynamics in superconductors have received a great deal of attention
from both fundamental and applied researchers over the past few decades.
Because of its critical role in the energy relaxation process of type II
superconductors, vortex dynamics have been deemed a key factor for the emerging
superconducting devices, but the effect of irradiation on vortex dynamics
remains unclear. With the support of electrical transport measurements under
external magnetic fields and irradiation, photon effect on vortex dynamics in
amorphous MoSi (a MoSi) superconducting thin films are investigated in this
work. The magnetic field dependent critical vortex velocity v* derived from the
Larkin Ovchinnikov model is not significantly affected by irradiation. However,
vortex depinning is found to be enhanced by photon-induced reduction in
potential barrier, which mitigates the adverse effect of film inhomogeneity on
superconductivity in the a MoSi thin films. The thorough understanding of the
vortex dynamics in a MoSi thin films under the effect of external stimuli is of
paramount importance for both further fundamental research in this area and
optimization of future superconducting devices.
