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@INPROCEEDINGS{Jin:824611,
      author       = {Jin, Wentao and Xiao, Yinguo and Su, Yixi and Nandi,
                      Shibabrata and Li, W. and Jiao, W. H. and Meven, Martin and
                      Sazonov, Andrew and Nisbet, G. and Demirdis, Sultan and
                      Feng, Erxi and Chen, Y. and Ting, C. S. and Cao, G. H. and
                      Brückel, Thomas},
      title        = {{M}agnetism in {E}u({F}e1-x{I}rx)2{A}s2 iron pnictides
                      studied by complementary scattering methods},
      reportid     = {FZJ-2016-07174},
      year         = {2016},
      abstract     = {Abstract: Doped EuFe2As2 is a unique representative of the
                      122 type family of iron based superconductors due to the two
                      magnetic sublattices and the strong coupling between spin-,
                      lattice- and charge degrees of freedom. In present work, the
                      magnetic ground states of the localized Eu2+ spins in
                      underdoped, nonsuperconducting Eu(Fe0.94Ir0.06)2As2 and
                      optimally doped, superconducting Eu(Fe0.88Ir0.12)2As2 (TSC =
                      22 K) were investigated by polarized and unpolarized
                      single-crystal neutron diffraction measurements,
                      respectively. The Eu2+ spins in the underdoped (x = 0.06)
                      crystal were found to order within the ab plane in the
                      A-type antiferromagnetic (AFM) structure. However, the Eu2+
                      spins in the optimally doped (x = 0.12) crystal were found
                      to be ferromagnetically aligned along the c direction with
                      an ordered moment of 7.0(1) μB at 2.5 K, coexisting with
                      the bulk superconductivity. In addition, compared with the
                      parent compound EuFe2As2, which shows the AFM order of the
                      Fe2+ moments below TN,Fe = 190 K, TN,Fe was significantly
                      suppressed to 85(2) K and completely suppressed, by $6\%$
                      and $12\%$ Ir doping, respectively. Most strikingly, the
                      x-ray resonant magnetic scattering measurements on the
                      underdoped (x = 0.06) crystal revealed the magnetic
                      polarization of the 5d Ir dopant atoms and suggested a
                      possible interplay between the localized Eu2+ moments and
                      the conduction d electrons on the FeAs layers.},
      month         = {Oct},
      date          = {2016-10-03},
      organization  = {Joint JCNS-Workshop and Flipper 2016
                       “Modern Trends in Neutron Scattering
                       from Magnetic Systems and
                       Single-crystal Diffraction with
                       Polarized Neutrons”, Tutzing
                       (Germany), 3 Oct 2016 - 7 Oct 2016},
      subtyp        = {Invited},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2 / PGI-4 / JARA-FIT /
                      Neutronenstreuung ; JCNS-1},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {524 - Controlling Collective States (POF3-524) / 6212 -
                      Quantum Condensed Matter: Magnetism, Superconductivity
                      (POF3-621) / 6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich
                      Centre for Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-524 / G:(DE-HGF)POF3-6212 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101 / EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/824611},
}