Local Magnetic Inhomogeneities in Lightly Doped BaFe$_2$As$_2$

Details Local Magnetic Inhomogeneities in Lightly Doped BaFe$_2$As$_2$ Local Magnetic Inhomogeneities in Lightly Doped BaFe$_2$As$_2$

2010-08-17

arxiv.org/abs/1008.2976v1

Phys. Rev. B 82, 140411(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.140411

We report $^{75}$As NMR measurements in BaFe$_2$As$_2$ doped with Ni. Like Co, Ni doping suppresses the antiferromagnetic and structural phase transitions and gives rise to superconductivity for sufficiently large Ni doping. The spin lattice relaxation rate diverges at $T_N$, with a critical exponent consistent with 3D ordering of local moments. In the ordered state the spectra quickly broaden inhomogeneously with doping. We extract the average size of the ordered moment as a function of doping, and show that a model in which the order remains commensurate but with local amplitude variations in the vicinity of the dopant fully explains our observations.

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