Ion channeling measurements on 90‐K and 60‐K YBCO provide evidence of an abrupt synchronization of certain lattice vibrations as T is lowered through Tc. This evidence supports a theoretical model in which kinetic energy is stored in pi‐electron holes circulating in Mo¨bius orbits; for T<Tcthese orbital excitations become locked together with the aid of synchronous lattice vibrations. A pattern of electric potential peaks and valleys driven by the synchronized orbiting holes carries mobile charges as singlet pairs, whose net flow in the presence of a vector potentialAconstitutes the observed supercurrent,J=−(e2‐n/mc)A.