Excess conductivity of HTSC ceramics YBa2Cu3O7–δ with TiO2 impurities

Abstract

In this work, the conductivity of YBa2Cu3O7−δ ceramics doped with Ti was studied. It is shown that the introduction of the TiO2 impurity leads to an increase in the number of effective scattering centers for normal carriers. The excess conductivity of the studied samples in a wide temperature range obeys an exponential temperature dependence, and near Tc it is satisfactorily described by the Aslamazov–Larkin theoretical model. In this case, the addition of Ti leads to a significant expansion of the temperature interval for the existence of excess conductivity in the ab plane.