Magnetically polarized Ir dopant atoms in superconducting Ba(Fe$_{1-x}$Ir$_x$)$_2$As$_2$

Details Magnetically polarized Ir dopant atoms in superconducting Ba(Fe$_{1-x}$Ir$_x$)$_2$As$_2$ Magnetically polarized Ir dopant atoms in superconducting Ba(Fe$_{1-x}$Ir$_x$)$_2$As$_2$

2012-02-20

arxiv.org/abs/1202.4492v3

Phys. Rev. B 85, 140514(R) (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

5 page, 3 figures

Scientific paper

10.1103/PhysRevB.85.140514

We investigate the magnetic polarization of the Ir $5d$ 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, $\xi_{\text{mag}}>$ 2800 and $>$850 \AA{}, in the $ab$-plane and along the c-axis, respectively, driven by their interaction with the Fe spins. This Ir magnetic order persists up to the N\'{e}el transition of the majority Fe spins at $T_N=74(2)$ K. At 5 K we find that magnetic order co-exists 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 lineshape, which we explain in terms of interference between Ir resonant scattering and Fe non-resonant magnetic scattering.

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