Abstract
Point defect models of the oxygen content isotherms in the orthorhombic domain of YBa 2 (Cu 1− y Zn y ) 3O 7− x ( y = 0.00, 0.02, 0.04) show that Zn has a 1 : 1 mixed Cu site occupancy for y = 0.02, 0.04, inducing oxygen vacancies on the apical-oxygen site and enhancing the localized character of the carriers. This observation can be linked to the observed T c versus doping curves which show a plateau-like behavior for 0.02< y<0.06 in the fully oxygenated samples, similar to the T c versus oxygen content curve in the undoped compound. This result has been interpreted as a consequence of the presence of zinc in the chains which gives rise to a nonlinear charge-transfer mechanism in the same way as occurs in undoped samples when oxygen is removed from the structure.
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