Oxygen Deficiency in YBa₂(Cu_1-xM_x)₃O_y (M=Al, Fe, Co, Ga) System

Abstract

Oxygen deficiency in YBa₂(Cu₁-xMx)₃O_y (M=Al, Fe, Co, Ga) system is discussed. Superconductivity of the impurity-doped system is much more sensitive to the oxygen defects compared with pure YBa₂Cu₃ Oy.It is suggested that this enhancement of oxygen-deficiency effect is associated with the oxygen disordering within the Cu1-0 layer. Monte Carlo simulation of oxygen configuration within the Cu1-0 layer of the impurity-doped system is presented.