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

Abstract

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.

4 pages, 4 figures

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Cited by in corpus (9)

• Muon spin rotation study of magnetism and superconductivity in Ba(Fe1-xCox)2As2 single crystals
• Critical Behavior of the SDW Transition in Underdoped Ba(Fe1-xCox)2As2 (x <=0.05): 75As NMR Investigation
• Commensurate antiferromagnetic ordering in Ba(Fe{1-x}Co{x})2As2 determined by x-ray resonant magnetic scattering at the Fe K-edge
• NMR study of nematic spin fluctuations in a detwinned single crystal of underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Local nematic susceptibility in stressed BaFe${}_2$As${}_2$ from NMR electric field gradient measurements
• A unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters
• Revealing the degree of magnetic frustration by non-magnetic impurities
• Uniaxial stress study of spin and charge stripes in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$ by ${}^{139}$La NMR and ${}^{63}$Cu NQR
• RKKY coupled local moment magnetism in NaFe${}_{1-x}$Cu${}_x$As