Dynamic behavior of reversible oxygen migration in irradiated-annealed high temperature superconducting wires.

ABSTRACT: We use atomically resolved scanning transmission electron microscopy and electron energy loss spectroscopy to determine the atomic-scale structural, chemical and electronic properties of artificial engineered defects in irradiated-annealed high temperature superconducting wires based on epitaxial Y(Dy)BCO film. We directly probe the oxygen vacancy defects in both plane and chain sites after irradiation with 18-meV Au ions. The plane site vacancies are reoccupied during post-annealing treatment. Our results demonstrate the dynamic reversible behavior of oxygen point defects, which explains the depression and recovery of self-field critical current and critical temperature in irradiation-annealing process. These findings reveal the strong effect of oxygen vacancies in different sites on the

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC7484753 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature