On electron pairing in unconventional superconductors

This paper presents a study whose aim is to decide whether the basic mechan ism of electron pairing is the same for all unconventional superconductors such as perovskites, cuprates, organic compounds and alkaly-stuffed fullere ne. By analyzing the features of these dissimilar materials, arguments are singled out showing that superconduction is originated by electrons combine d in weakly bound pairs running in regions bordering on certain lattice dis continuities which are common to the structure of the superconductors dealt with, Special attention is devoted to the properties of the YBCO cuprate.