Abstract
We have used 75As NMR and x-ray diffraction analysis to study the structural and electronic inhomogeneities in Ba(Fe1−xNix)2As2 crystals with x near the border of the antiferromagnetic domain. Unequal nickel population of the equivalent Fe planes and rather homogeneous distribution of Ni inside the planes have been found in the well-ordered single crystal with x = 0.036. Below 40 K a signal wipeout of 75As NMR spectra is observed for the crystals with x = 0.036 and 0.037. This fact together with spin-lattice relaxation peculiarities is treated a result of the system glassy behavior in this region of the phase diagram. The 75As NMR data also indicate on partial suppression of antiferromagnetic spin fluctuations around the Ni impurity in these crystals at low temperatures.
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