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Here we present a combined study of the slightly underdoped novel pnictidesuperconductor Ba(1-x)K(x)Fe(2)As(2) by means of X-ray powder diffraction,neutron scattering, muon spin rotation (muSR), and magnetic force microscopy(MFM). Commensurate static magnetic order sets in below Tm ~ 70 K as inferredfrom the emergence of the magnetic (1 0 -3) reflection in the neutronscattering data and from the observation of damped oscillations in thezero-field-muSR asymmetry. Transverse-field muSR below Tc shows a coexistenceof magnetically ordered and non-magnetic states, which is also confirmed by MFMimaging. We explain such coexistence by electronic phase separation intoantiferromagnetic and superconducting/normal state regions on a lateral scaleof several tens of nanometers. Our findings indicate that such mesoscopic phaseseparation can be considered an intrinsic property of some iron pnictidesuperconductors.

Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe(2)As(2)