Phase diagram of the PrFeAsO$_{1-x}$F$_{x}$ superconductor

TL;DR

This study maps the phase diagram of PrFeAsO$_{1-x}$F$_{x}$, revealing how fluorine doping suppresses structural and magnetic transitions and induces superconductivity with a maximum T$_{C}$ of 47 K at optimal doping.

Contribution

The paper provides the first comprehensive phase diagram of PrFeAsO$_{1-x}$F$_{x}$, detailing the relationship between doping levels, structural/magnetic transitions, and superconductivity.

Findings

Structural transition suppressed from 154 K to 120 K

Magnetic order of Fe and Pr ions suppressed at x≈0.08

Superconductivity emerges at x≈0.08 with T$_{C}$=47 K

Abstract

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