Magnetically polarized Ir dopant atoms in superconducting Ba(Fe${}_{1\ensuremath{-}x}$Ir${}_{x}$)${}_{2}$As${}_{2}$

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Magnetically polarized Ir dopant atoms in superconducting Ba(Fe $_{1 - x}$ Ir $_{x}$ ) $_{2}$ As $_{2}$

M. P. M. Dean, M. G. Kim, A. Kreyssig, J. W. Kim, X. Liu, P. J. Ryan, A. Thaler, S. L. Bud'ko, W. Strassheim, P. C. Canfield, J. P. Hill, and A. I. Goldman

Phys. Rev. B 85, 140514(R) – Published 25 April 2012

Abstract

We investigate the magnetic polarization of the Ir $5 d$ dopant states in the pnictide superconductor Ba(Fe $_{1 - x}$ Ir $_{x}$ ) $_{2}$ As $_{2}$ with $x = 0.027 (2)$ using Ir $L_{3}$ edge x-ray resonant magnetic scattering (XRMS). Despite the fact that doping partially suppresses the antiferromagnetic transition, we find that magnetic order survives around the Ir dopant sites. The Ir states are magnetically polarized with commensurate stripe-like antiferromagnetic order and long correlations lengths, $ξ_{mag} > 2800$ and $>$ 850 Å, in the $a b$ plane and along the $c$ axis, respectively, driven by their interaction with the Fe spins. This Ir magnetic order persists up to the Néel transition of the majority Fe spins at $T_{N} = 74 (2)$ K. At 5 K we find that magnetic order coexists microscopically with superconductivity in Ba(Fe $_{1 - x}$ Ir $_{x}$ ) $_{2}$ As $_{2}$ . The energy dependence of the XRMS through the Ir $L_{3}$ edge shows a non-Lorentzian line shape, which we explain in terms of interference between Ir resonant scattering and Fe nonresonant magnetic scattering.

Received 20 February 2012

DOI:https://doi.org/10.1103/PhysRevB.85.140514

Authors & Affiliations

M. P. M. Dean^1,*, M. G. Kim^2,†, A. Kreyssig², J. W. Kim³, X. Liu¹, P. J. Ryan³, A. Thaler², S. L. Bud'ko², W. Strassheim², P. C. Canfield², J. P. Hill¹, and A. I. Goldman²

¹Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
²Ames Laboratory, US Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
³Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

^*mdean@bnl.gov
^†mgkim@iastate.edu

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Vol. 85, Iss. 14 — 1 April 2012

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Physical Review B

covering condensed matter and materials physics

Magnetically polarized Ir dopant atoms in superconducting Ba(Fe $_{1 - x}$ Ir $_{x}$ ) $_{2}$ As $_{2}$

M. P. M. Dean, M. G. Kim, A. Kreyssig, J. W. Kim, X. Liu, P. J. Ryan, A. Thaler, S. L. Bud'ko, W. Strassheim, P. C. Canfield, J. P. Hill, and A. I. Goldman

Phys. Rev. B 85, 140514(R) – Published 25 April 2012

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Physical Review B

covering condensed matter and materials physics

Magnetically polarized Ir dopant atoms in superconducting Ba(Fe1−xIrx)2As2

M. P. M. Dean, M. G. Kim, A. Kreyssig, J. W. Kim, X. Liu, P. J. Ryan, A. Thaler, S. L. Bud'ko, W. Strassheim, P. C. Canfield, J. P. Hill, and A. I. Goldman

Phys. Rev. B 85, 140514(R) – Published 25 April 2012

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Magnetically polarized Ir dopant atoms in superconducting Ba(Fe $_{1 - x}$ Ir $_{x}$ ) $_{2}$ As $_{2}$