The electronic phase diagram of ${\text{PrFeAsO}}_{1-x}{\text{F}}_x$ $\left(0\le x\le 0.225\right)$ has been determined using synchrotron x-ray powder-diffraction, magnetization, and resistivity measurements. The structural transition temperature is suppressed from 154 to $\approx 120\text{K}$ and the magnetic phase transitions of both iron and praseodymium ions are completely suppressed by $x\approx 0.08$ fluorine doping, coinciding with the emergence of superconductivity. The optimal doping is $x\approx 0.15$ when $T_C=47\text{K}$ while the maximum solubility of fluorine in ${\text{PrFeAsO}}_{1-x}{\text{F}}_x$ is reached around $x=0.22$. The structural, magnetic, and superconducting phase diagram is presented.

• Received 7 July 2009

DOI:https://doi.org/10.1103/PhysRevB.80.144517