Possibility of the high-Tcoxide Y-Ba-Cu-O as a Bardeen-Cooper-Schrieffer superconductor

We present a theoretical analysis of experimental data for the magnetic penetration depth, the upper critical field, and the critical temperature of the high-${\mathit{T}}_{\mathit{c}}$ oxide Y-Ba-Cu-O, using a BCS-like theory. The result is a unique set of normal-state parameters of the charge carriers. It is pointed out that an experimental and theoretical proof of these parameters will provide a distinctive step towards a proof of the validity of BCS-like theories in describing the superconducting properties of high-${\mathit{T}}_{\mathit{c}}$ superconductors. Aspects of the possibility of the standard electron-phonon-interaction model are also investigated.