Abstract
Electrical, magnetic, and crystallographic measurements have been carried out for lanthanum-and oxygen-deficient La2-xCuO4- samples prepared at various sintering temperatures and cooling rates in air, oxygen, or argon, in order to check the systematic variation of filamentary superconductivity and normal-state electrical resistivity with lanthanum and oxygen content. Correlation between physical properties and the oxygen stoichiometric parameter clearly indicates the crucial role of oxygen in the superconducting properties of this system. On the other hand, lanthanum deficiency has little effect on superconductivity. © 1988 The American Physical Society.