TOWARDS THE POSSIBILITY OF INCREASING T(C) OF OXIDE SUPERCONDUCTORS THROUGH COHERENT INTERACTION OF PLANAR DEFECTS

It is shown that the change in distance d between two linear defects in a two-dimensional superconductor can lead to the existence of periodical singularities T(c) is similar to (d-d(n))-1 in the dependence of transition temperature on d; such singularities are the strongest among the ones known at present. The smoothing of these singularities is investigated with the following cutoff factors taken into account: inequality to zero of the coefficient of transmission through defects, quasiparticle attenuation, the finiteness of the temperature. The opportunity of raising T(c) of oxide superconductors by inserting planar defects normal to the Cu-O planes is discussed.