Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase diagram of the PrFeAsO$_{1-x}$F$_{x}$ superconductor   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.

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The categories of this paper are: hep-lat
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The categories of this paper are: math
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: econ
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th