Abstract
The effect of oxygen non-stoichiometry on the superconducting characteristics of the La 2− x Sr x CuO 4+ δ compound in the underdoped region ( x<0.16) is reassessed. Although superconductivity in the La 2− x Sr x CuO 4+ δ compound can be unambiguously attributed to the holes in the CuO 2 sheet in the structure, the hole content (ϱ sh) cannot be regarded as equal to the Sr content, x, as was frequently assumed. The parabolic relation between T c and x for La 2− x Sr x CuO 4+ δ is shown to not fully represent the intrinsic relation between T c and hole content for the p-type high- T c cuprates, but to be related to the variation of oxygen non-stoichiometry in the under-doped region. It is demonstrated that the intrinsic relation of T c vs. ϱ sh can be derived from the parabolic T c- x relation in the under-doped region of this system, and vice versa, provided that the variation of oxygen content with x is properly taken into account.
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