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@ARTICLE{Zhu:885796,
      author       = {Zhu, Fengfeng and Wang, Xiao and Meven, Martin and Song,
                      Junda and Mueller, Thomas and Yi, Changjiang and Ji, Wenhai
                      and Shi, Youguo and Ma, Jie and Schmalzl, Karin and Schmidt,
                      Wolfgang and Su, Yixi and Brückel, Thomas},
      title        = {{M}agnetic structures, spin-flop transition, and coupling
                      of {E}u and {M}n magnetism in the {D}irac semimetal
                      {E}u{M}n{B}i$_2$},
      journal      = {Physical review research},
      volume       = {2},
      number       = {4},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2020-04093},
      pages        = {043100},
      year         = {2020},
      abstract     = {In recently emerging correlated topological materials, such
                      as magnetic Dirac/Weyl semimetals, additional tunabilities
                      of their transport and magnetic properties may be achieved
                      by utilizing possible interaction between the exotic
                      relativistic fermions and magnetic degree of freedom. The
                      two-dimensional antiferromagnetic (AFM) Dirac semimetal
                      EuMnBi2, in which an intricate interplay between multiple
                      magnetic sublattices and Dirac fermions was suggested,
                      provides an ideal platform to test this scenario. We report
                      here a comprehensive study of the AFM structures of the Eu
                      and Mn magnetic sublattices as well as the interplay between
                      Eu and Mn magnetism in this compound by using both polarized
                      and nonpolarized single-crystal neutron diffraction.
                      Magnetic susceptibility, specific heat capacity
                      measurements, and the temperature dependence of magnetic
                      diffractions suggest that the AFM ordering temperatures of
                      the Eu and Mn moments are at 22 and 337 K, respectively. The
                      magnetic moments of both Eu and Mn ions are oriented along
                      the crystallographic c axis, and the respective magnetic
                      propagation vectors are kEu=(0,0,1) and kMn=(0,0,0). With
                      proper neutron absorption correction, the ordered moments
                      are refined at 3 K as 7.7(1) and 4.1(1) μB for the Eu and
                      Mn ions, respectively. In addition, a spin-flop (SF) phase
                      transition of the Eu moments in an applied magnetic field
                      along the c axis was confirmed to take place at a critical
                      field of Hc≈ 5.3 T. The AFM exchange interaction and
                      magnetic anisotropy parameters (J=0.81 meV, Ku=0.18 meV,
                      Ke=−0.11 meV) are determined based on a subsequent
                      quantitative analysis of the SF transition. The evolution of
                      the Eu magnetic moment direction as a function of the
                      applied magnetic field in the SF phase was also determined.
                      Clear kinks in both field and temperature dependences of the
                      magnetic reflections (±1, 0, 1) of Mn were observed at the
                      onset of the SF phase transition and the AFM order of the Eu
                      moments, respectively. This unambiguously indicates the
                      existence of a strong coupling between Eu and Mn magnetism.
                      The interplay between two magnetic sublattices could bring
                      new possibilities to tune Dirac fermions via changing
                      magnetic structures by applied fields in this class of
                      magnetic topological semimetals.},
      cin          = {JCNS-FRM-II / MLZ / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 144 - Controlling Collective
                      States (POF3-144) / 6G15 - FRM II / MLZ (POF3-6G15) / 6G4 -
                      Jülich Centre for Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-144 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)DNS-20140101 / EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000605396900008},
      doi          = {10.1103/PhysRevResearch.2.043100},
      url          = {https://juser.fz-juelich.de/record/885796},
}