Possible effect of oxygen content on the under-doped characteristics of the La2−xSrxCuO4+δ compound

✍ Scribed by Huanbo Zhang; Hiroshi Sato; Gerald L. Liedl

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 433 KB
• Volume: 234
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90071-x

✦ Synopsis

The effect of oxygen non-stoichiometry on the superconducting characteristics of the La2_$rXCu04+6 compound in the underdoped region (XX 0.16) is reassessed. Although superconductivity in the La2_3rXCu0 4+6 compound can be unambiguously attributed to the holes in the CuOZ sheet in the structure, the hole content (psh) cannot be regarded as equal to the Sr content, x, as was frequently assumed. The parabolic relation between r, and x for La2_,SrXCu04+6 is shown to not fully represent the intrinsic relation between T', and hole content for the p-type high-T, cuprates, but to be related to the variation of oxygen nonstoichiometry in the under-doped region. It is demonstrated that the intrinsic relation of T, vs. psh can be derived from the parabolic T,-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.