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We present a systematic study on the heavily Cr doped iron pnictidesBaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$ by using elastic neutron scattering,high-resolution synchrotron X-ray diffraction (XRD), resistivity and Halltransport measurements. When the Cr concentration increases from $x=$ 0 to 0.8,neutron diffraction experiments suggest that the collinear antiferromagnetismpersists in the whole doping range, where the N\'{e}el temperature $T_N$coincides with the tetragonal-to-orthorhombic structural transition temperature$T_s$, and both of them keeps around 35 K. The magnetic ordered moment, on theother hand, increases within increasing $x$ until $x=$ 0.5, and then decreaseswith further increasing $x$. Detailed refinement of the powder XRD patternsreveals that the Cr substitutions actually stretch the FeAs$_4$ tetrahedronalong the $c-$axis and lift the arsenic height away Fe-Fe plane. Transportresults indicate that the charge carriers become more localized upon Cr doping,then changes from electron-type to hole-type around $x=$ 0.5. Our resultssuggest that the ordered moment and the ordered temperature of static magnetismin iron pnictides can be decoupled and tuned separately by chemical doping.

Doping effects of Cr on the physical properties of BaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$