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@ARTICLE{Vrtnik:858867,
      author       = {Vrtnik, S. and Lužnik, J. and Koželj, P. and Jelen, A.
                      and Luzar, J. and Jagličić, Z. and Meden, A. and
                      Feuerbacher, M. and Dolinšek, J.},
      title        = {{D}isordered ferromagnetic state in the
                      {C}e-{G}d-{T}b-{D}y-{H}o hexagonal high-entropy alloy},
      journal      = {Journal of alloys and compounds},
      volume       = {742},
      issn         = {0925-8388},
      address      = {Amsterdam [u.a.]},
      publisher    = {ScienceDirect},
      reportid     = {FZJ-2018-07703},
      pages        = {877 - 886},
      year         = {2018},
      abstract     = {Rare-earth (RE) based hexagonal high-entropy alloys (HEAs)
                      containing elements from the heavy half of the RE series
                      (from Gd to Lu) are considered as prototypes of an ideal
                      HEA, stabilized by the entropy of mixing with completely
                      random distribution of the elements on an almost undistorted
                      hexagonal close-packed (hcp) lattice. Here we present a
                      study of the Ce-Gd-Tb-Dy-Ho hexagonal HEA (abbreviated as
                      HEA-Ce), where a light-RE element Ce is alloyed with four
                      heavy-RE elements. Since the binary mixing enthalpies of Ce
                      with these elements are all zero, random mixing of the
                      elements and an ideal solid solution can also be expected.
                      Contrary to the expectations, a two-phase structure forms in
                      the HEA-Ce, consisting of the majority hcp matrix and the
                      rhombohedral precipitates that occupy a significant fraction
                      of the sample's volume, with both phases having very similar
                      composition. The “ideality” of the HEA-Ce solid solution
                      is very likely compromised by the fact that the crystal
                      structure of Ce is different from the structures of other
                      elements. By performing measurements of the magnetic
                      properties, the specific heat and the electrical resistivity
                      in a magnetic field, we have determined the magnetic state
                      of the HEA-Ce. Long-range-ordered periodic magnetic
                      structures do not form (like they do in the hexagonal HEAs
                      containing heavy-RE elements only), but the magnetic
                      structure breaks up into ferromagnetically (FM) polarized
                      spin domains distributed in size that orient randomly in
                      zero field. The magnetically ordered state of the HEA-Ce can
                      be described as a disordered FM state with a 2nd-order
                      thermodynamic FM phase transition at 140 K. The
                      introduction of Ce did not yield any of the phenomena that
                      are exceptional for the Ce-containing alloys and compounds
                      (mixed valence, heavy-fermion, unconventional
                      superconductivity).},
      cin          = {PGI-5},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000427505800105},
      doi          = {10.1016/j.jallcom.2018.01.331},
      url          = {https://juser.fz-juelich.de/record/858867},
}