The magnetic and superconducting phase diagram of PrFeAsF$_{x}$O$_{1-x}$*

The electronic phase diagram of the newly discovered iron pnictide superconductors RFeAsO$_{1-x}$F$_{x}$ (R=rare-earth) is of great interest and with implications in the understanding of the nature of superconductivity (SC) itself. Predicted by \textit{ab initio} calculations [1] and pointed by resistivity measurements [2], the relevance of a quantum critical point remains controversial in the light of the structural phase transition between the magnetic SDW and SC [3]. We present a detailed magnetic and superconducting phase diagram of PrFeAsO$_{1-x}$F$_{x}$ as inferred from magnetic susceptibility and resistivity measurements. References: [1] G. Giovannetti \textit{et al.}, Physica B \textbf{403}, 3653 (2008) [2] R. H. Liu \textit{et al.}, Phys Rev Lett \textbf{101}, 087001 (2008) [3] H. Luetkens et al., cond.mat:0806.3533