Incommensurate Spin Density Wave versus local magnetic inhomogeneities in Ba(Fe_{1-x}Ni_x)2As2: a 57Fe Mossbauer spectroscopy study

Details Incommensurate Spin Density Wave versus local magnetic inhomogeneities in Ba(Fe_{1-x}Ni_x)2As2: a 57Fe Mossbauer spectroscopy study Incommensurate Spin Density Wave versus local magnetic inhomogeneities in Ba(Fe_{1-x}Ni_x)2As2: a 57Fe Mossbauer spectroscopy study

2011-06-07

arxiv.org/abs/1106.1332v1

Physics

Condensed Matter

Superconductivity

8 pages, 9 figures

Scientific paper

We report 57Fe Mossbauer spectroscopy results in pure and underdoped Ba(Fe_{1-x}Ni_x)2As2 with x=0.01 and x=0.03. We show that all these materials present a first-order magnetic transition towards a spin density wave state. In the doped systems, a large distribution of Fe hyperfine fields is present in the magnetic state. We interpret the data in Ba(Fe_{1-x}Ni_x)2As2 in relation with 75As NMR results, in the framework of two different models: 1) an incommensurate spin density wave, which was previously proposed to interpret the Mossbauer spectra in Co-doped samples; 2) an impurity-induced perturbation of the Fe polarization, as recently proposed to interpret the NMR data. We show that this "impurity" model, which is valid only in the very low doping region, can also fit correctly the Mossbauer spectra, and that the "incommensurate" model also fits well the 75As NMR data (at all doping values) contrary to what has been claimed recently. We finally discuss the existence of the incommensurate spin density wave in relation with very recent neutron diffraction data in Co-doped samples.

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