Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

4-1-2012

Journal or Book Title

Physical Review B

Volume

85

Issue

14

First Page

140514(R)

DOI

10.1103/PhysRevB.85.140514

Abstract

We investigate the magnetic polarization of the Ir 5d dopant states in the pnictide superconductor Ba(Fe1−xIrx)2As2 with x=0.027(2) using Ir L3 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, ξmag>2800 and >850 Å, 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 Néel transition of the majority Fe spins at TN=74(2) K. At 5 K we find that magnetic order coexists microscopically with superconductivity in Ba(Fe1−xIrx)2As2. The energy dependence of the XRMS through the Ir L3 edge shows a non-Lorentzian line shape, which we explain in terms of interference between Ir resonant scattering and Fe nonresonant magnetic scattering.

Comments

This article is published as Dean, M. P. M., 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. "Magnetically polarized Ir dopant atoms in superconducting Ba (Fe 1− x Ir x) 2 As 2." Physical Review B 85, no. 14 (2012): 140514(R). DOI: 10.1103/PhysRevB.85.140514. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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