Patent ID: 7642222

Claim:
An article comprising: a base substrate including a layer of an oriented cubic oxide material having a rock-salt-like structure layer thereon; and, a buffer layer upon the oriented cubic oxide material having a rock-salt-like structure layer, the buffer layer having an outwardly facing surface with a surface morphology including particulate outgrowths of from 10 nm to 500 nm in size and composed of the same material as said buffer layer at said surface, said particulate outgrowths having a surface density characterized as sufficiently high so as to yield a higher Jc in any adjacent high temperature superconductive oxide material under in-field conditions in comparison to a similar high temperature superconductive oxide material in the absence of such a surface density of said particulate outgrowths, said surface density further characterized as insufficient in magnitude so as to yield a significant reduction in Jc at self-field.