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Local magnetic inhomogeneities in Ba(Fe1xNix)2As2 as seen via A75s NMR

A. P. Dioguardi, N. apRoberts-Warren, A. C. Shockley, S. L. Bud’ko, N. Ni, P. C. Canfield, and N. J. Curro
Phys. Rev. B 82, 140411(R) – Published 26 October 2010

Abstract

We report A75s NMR measurements in BaFe2As2 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 TN with a critical exponent consistent with three-dimensional 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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  • Received 17 August 2010

DOI:https://doi.org/10.1103/PhysRevB.82.140411

©2010 American Physical Society

Authors & Affiliations

A. P. Dioguardi1, N. apRoberts-Warren1, A. C. Shockley1, S. L. Bud’ko2, N. Ni2, P. C. Canfield2, and N. J. Curro1,*

  • 1Department of Physics, University of California, Davis, California 95616, USA
  • 2Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *curro@physics.ucdavis.edu

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Vol. 82, Iss. 14 — 1 October 2010

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