IMPLICATIONS OF SUPERCONDUCTIVITY IN PRBA2CU3O7

The recent experimental demonstrations that PrBa2Cu3O7 (Pr123) superco nducts, much as other (rare-earth) 123 compounds do when fabricated wi thout defects, imply that (i) the superconductivity originates in the charge-reservoirs, not in the cuprate planes, (ii) all Y123/Pr123 supe rlattice, Josephson junction, and tunneling experiments of the last de cade should be re-examined, (iii) Pr-Ba should be a good flux-pinning defect, (iv) high-temperature superconducting electronics is likely to be monopolar (p-type), and (v) all developments of the last decade ba sed on cuprate-plane models should be re-examined.