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We report muon spin relaxation/rotation (uSR) measurements of single crystalBa(Fe1-xCox)2As2 with x=0.038 and 0.047. Zero field (ZF)-uSR and Transversefield (TF)-iSR measurements of these underdoped samples find the presence ofmagnetism and superconductivity. We find internal fields along the c-axis whosemagnitude decreases with increasing doping. We find evidence for alow-temperature volume fraction that is only weakly magnetic, where that volumefraction increases with increasing Co doping of the sample. TF-uSR measurementsshow slight changes in the spectra that indicate magnetic inhomogeneities dueto the loss of Fe moments in the system, the effect of which is larger in thehigher Co doping. We discuss the existence of superconductivity in thesesamples in close proximity to strong magnetic order.

Magnetic and Superconducting Properties of Underdoped Ba(Fe1-xCox)2As2 Measured with Muon Spin Relaxation/Rotation