Some diffusive properties of oxygen in Y-Ba-Cu-O systems

s74.30C 74.70V74.70574.70Y Some diffusive properties of oxygenin Y-Ba-Cu-O systems D. Djurek(~), V. Manojlov16(~), Z.Medun16 (1), M. Prester(2), E. Bab16(3) and K.Zadro(3) (1) Volta Applied Ceramics, 41000 Zagreb, Croatia, Yugoslavia (2) Instituteof Physics oftile UniversityZagreb, 41000 Croatia, Yugoslavia (3) Department of Physics,Faculty Natural Sciences,41000 Zagreb,Croatia,Yugoslavia(Received 21 August 1991, accepted 4October I991) Abstract.Wehavestudiedtilediffusive properties ofoxygeninY-Ba-Cu-O systems at 940°C by measurements oftileresistiveresponsetime r the samplessubjected to step-lflce increaseoftileoxygenpressure Apo~~ I to 5 bars. The superconducting(SC) transitionwidtlis AT~ plotted versus inverse diffusion constantD r obey the universal linear dependence. Thecharacteristic protruded tailofthereal part of AC susceptibility whichexhibitsthefeature at 86Kisabsentin samples withthenominal compositionY~Ba~CU~O~(Y-336) the regime r < 3 sas resultof weakly connected