Generic superconducting phase behavior in high-Tccuprates:Tc

A direct determination of the relationship between ${\mathit{T}}_{\mathit{c}}$ and hole concentration p for ${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ is obtained by investigating the properties of the fully oxygen-deficient (\ensuremath{\delta}\ensuremath{\approxeq}1.0) compound for which p=x/2. Measurements of ${\mathit{T}}_{\mathit{c}}$, the thermoelectric power S, and bond-valence sums calculated from neutron-diffraction refinements for various values of x and \ensuremath{\delta} allow the full determination of the relations p=p(\ensuremath{\delta}), ${\mathit{T}}_{\mathit{c}}$=${\mathit{T}}_{\mathit{c}}$(p), and S=S(T,p) confirming that ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ satisfies the same universal relations in these quantities as the other high-${\mathit{T}}_{\mathit{c}}$ superconducting cuprates.