Magnetically polarized Ir dopant atoms in superconducting Ba(Fe1-xIrx)(2)As-2

TitleMagnetically polarized Ir dopant atoms in superconducting Ba(Fe1-xIrx)(2)As-2
Publication TypeJournal Article
Year of Publication2012
AuthorsDean MPM, Kim MG, Kreyssig A, Kim JW, Liu X, Ryan PJ, Thaler A, Bud'ko SL, Strassheim W, Canfield PC, Hill JP, Goldman AI
Journal TitlePhysical Review B
Volume85
Pages140514
Date Published04
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000303192800002
Keywordsbafe2as2, pnictides, scattering, state
Abstract

We investigate the magnetic polarization of the Ir 5d dopant states in the pnictide superconductor Ba(Fe1-xIrx)(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(mag) > 2800 and > 850 angstrom, 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 Neel 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(Fe1-xIrx)(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.

URL<Go to ISI>://WOS:000303192800002
DOI10.1103/PhysRevB.85.140514
Alternate JournalPhys. Rev. B