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We report 57Fe Mossbauer spectral results in pure and doped Ba(Fe1-xNix)2As2with x=0.01 and 0.03. We show that all these materials present a first-ordermagnetic transition towards a magnetically ordered state. In the dopedcompounds, a broad distribution of Fe hyperfine fields is present in themagnetic phase. We successfully fit the Mossbauer data in Ba(Fe1-xNix)2As2 inthe framework of two different models: 1) an incommensurate spin density wave;2) a dopant-induced perturbation of the Fe polarization, recently proposed tointerpret 75As NMR data in Ba(Fe1-xNix)2As2, which is valid only in the verydilute limit x=0.01. Moreover, we show here that these NMR data can also besuccessfully analysed in terms of the 'incommensurate model' for all dopingcontents by using the parameters obtained from the Mossbauer spectral analysis.Therefore it is not possible to rule out the presence of an incommensurate spindensity wave on the basis of the 75As NMR data.

Incommensurate Spin Density Wave versus local magnetic inhomogeneities in Ba(Fe1-xNix)2As2: a 57Fe Mossbauer spectroscopy study