Competition between superconductivity and antiferromagnetism in Cu(2) layers of ${\mathrm{Y}}_{1\mathrm{-}\mathit{x}}$${\mathrm{Pr}}_{\mathit{x}}$${\mathrm{Ba}}_2$${\mathrm{Cu}}_{3\mathrm{-}\mathit{y}}$${\mathit{M}}_{\mathit{y}}$${\mathrm{O}}_{\mathit{z}}$, M=Fe,Co,Zn

The antiferromagnetic (AFM) and superconducting (SC) phase-transition temperatures of ${\mathrm{Y}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Pr}}_{\mathit{x}}$ ${\mathrm{Ba}}_2$ ${\mathrm{Cu}}_{3\mathrm{-}\mathit{y}}$ ${\mathit{M}}_{\mathit{y}}$ ${\mathrm{O}}_{\mathit{z}}$, M=Fe,Co,Zn, were studied by magnetometry and ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ Mössbauer spectroscopy. For z∼7, substitutions at all sites except those in the ${\mathrm{CuO}}_2$ planes (Pr,Fe,Co) cause superconductivity to disappear at ${\mathit{x}}_{\mathit{c}}$=0.5 or ${\mathit{y}}_{\mathit{c}}$=0.4 and antiferromagnetism to appear above ${\mathit{x}}_{\mathit{c}}$ and ${\mathit{y}}_{\mathit{c}}$. For z∼6, antiferromagnetism persists for all x and y values. On the other hand, substitution in the Cu(2) planes (Zn) suppresses both superconductivity at ${\mathit{y}}_{\mathit{c}}$=0.24 for z∼7 and antiferromagnetism for z∼6. No antiferromagnetism is seen for z∼7.