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We present a muon spin rotation (\muSR) study of the magnetic andsuperconducting properties of single crystals of electron-doped BaFe2-xCoxAs2with x=0.08, 0.20, and 0.25 (Tc=9, 25 and 20K) and of polycrystallinehole-doped Pr1-xSrxFeAsO with x=0 and 0.2 (Tc=15 K). In the former series weobserve some interesting parallels with the electron doped SmFeAsO1-xFx1111-type system [A.J. Drew et al., to appear in Nature Materials 2009 andarXiv:0807.4876]. In particular, we obtain evidence that strongly disorderedstatic magnetism coexists with superconductivity on a microscopic scale inunderdoped samples and even at optimum doping there is a slowing down (orenhancement) of dynamic magnetic correlations below Tc\approx25K. To thecontrary, for the hole-doped Pr1-xSrxFeAsO samples we obtain evidence for amesoscopic phase segregation into regions with nearly unperturbed AF order andothers that are non magnetic and most likely superconducting. The observedtrend resembles the one that was previously reported for hole-dopedBa1-xKxFe2As2 [A.A. Aczel et al., Phys. Rev. B 78, 214503 (2008); J.T. Park etal., arXiv:0811.2224] and thus seems to be fairly common in these hole dopedsystems.

Muon spin rotation study of magnetism and superconductivity in BaFe2-xCoxAs2 and Pr1-xSrxFeAsO