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Muon-spin-relaxation studies of magnetic order and superfluid density in antiferromagnetic NdFeAsO,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>BaFe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>, and superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:…
Zero-field (ZF) muon-spin-relaxation $(\ensuremath{\mu}\text{SR})$ measurements have revealed static commensurate magnetic order of Fe moments in NdFeAsO below ${T}_{N}\ensuremath{\sim}135\text{ }\text{K}$, with the ordered moment size nearly equal to that in LaFeAsO, and confirmed similar behavior in ${\text{BaFe}}_{2}{\text{As}}_{2}$. In single crystals of superconducting ${\text{Ba}}_{0.55}{\text{K}}_{0.45}{\text{Fe}}_{2}{\text{As}}_{2}$, $\ensuremath{\mu}\text{SR}$ spectra indicate static magnetism with incommensurate or …