New Effect on the Dependence of T sub c on the Number of Cu-O Layers in the Non-Rare-Earth Ceramic Superconductors.

摘要

We argue from the experimental evidence that the superconductivity in the non-rare-earth compounds is confined to two inequivalent layers of Cu-O planes where electron pairing occurs. This conjecture leads us to a set of phenomenological equations in terms of two order parameters that correctly describe the characteristic lengths of the copper oxide ceramics. The formalism developed indicates that samples with a larger number of Cu-O layers may have higher transition temperatures. The formalism suggests that in a multilayered Cu-O compound increments of T/sub c/ as a function of the doping parameter will be more pronounced the larger the number of layers. (author). 12 refs. (Atomindex citation 19:102780)