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

A. P. Dioguardi; N. apRoberts-Warren; A. C. Shockley; S. L. Bud'ko; N. Ni; P. C. Canfield; N. J. Curro

doi:10.1103/PhysRevB.82.140411

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

Strongly Correlated Electrons 2010-11-08 v1 Superconductivity

Authors: A. P. Dioguardi , N. apRoberts-Warren , A. C. Shockley , S. L. Bud'ko , N. Ni , P. C. Canfield , N. J. Curro

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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.

Keywords

nuclear magnetic resonance iron-based superconductor doping effect antiferromagnetic order spin-lattice relaxation local moment inhomogeneous broadening

Cite

@article{arxiv.1008.2976,
  title  = {Local Magnetic Inhomogeneities in Lightly Doped BaFe$_2$As$_2$},
  author = {A. P. Dioguardi and N. apRoberts-Warren and A. C. Shockley and S. L. Bud'ko and N. Ni and P. C. Canfield and N. J. Curro},
  journal= {arXiv preprint arXiv:1008.2976},
  year   = {2010}
}

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4 pages, 4 figures

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

Abstract

Keywords

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