DISPLACEMENT THRESHOLD ENERGIES IN HIGH-TEMPERATURE SUPERCONDUCTORS

The running of Cu-O collision chains in the (001) direction is investigated in YBA2Cu3O7 by the molecular dynamics method. We show that there are two ways of point defect formation in these chains. The first one creates a stable Frenkel pair in the Cu sublattice. The second process is the displacement of an oxygen ion from the position in the chain to an O(5) vacancy. The angular dependences of the second displacement threshold energy are presented. The influence of an injection additional oxygen has been investigated. The contour of the threshold energy can be drastically changed by introducing oxygen in vacant sites.