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@ARTICLE{Krnel:878668,
      author       = {Krnel, M. and Vrtnik, S. and Jelen, A. and Koželj, P. and
                      Jagličić, Z. and Meden, A. and Feuerbacher, M. and
                      Dolinšek, J.},
      title        = {{S}peromagnetism and asperomagnetism as the ground states
                      of the {T}b-{D}y-{H}o-{E}r-{T}m “ideal” high-entropy
                      alloy},
      journal      = {Intermetallics},
      volume       = {117},
      issn         = {0966-9795},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2020-02989},
      pages        = {106680 -},
      year         = {2020},
      abstract     = {We address the nature of the collective magnetic state in
                      an ideal high-entropy alloy (HEA), representing a
                      magnetically concentrated system with all lattice sites
                      occupied by localized magnetic moments and containing
                      randomness and frustration due to chemical disorder. Being a
                      “metallic glass on a topologically ordered lattice”,
                      HEAs possess simultaneously the properties of an ordered
                      crystal and an amorphous glass. The influence of this
                      crystal-glass duality on the collective magnetic state was
                      studied experimentally on a hexagonal Tb-Dy-Ho-Er-Tm (TDHET)
                      HEA, composed of rare-earth (RE) elements with zero pair
                      mixing enthalpies that assure completely random mixing of
                      the elements and very similar atomic radii that minimize
                      lattice distortions, representing a prototype of an ideal
                      HEA. The TDHET HEA is characterized by probability
                      distributions of the atomic moments , the exchange
                      interactions , the magnetocrystalline anisotropy , and the
                      dipolar interactions . Based on the measurements of the
                      static and dynamic magnetization, the magnetization curves,
                      the thermoremanent magnetization, the specific heat and the
                      magnetoresistance, we found that the collective magnetic
                      state of the TDHET is temperature-dependent, forming a
                      speromagnetic (SPM) state in the temperature range between
                      about 140 and 30 K and an asperomagnetic (ASPM) state below
                      20 K. In the intermediate temperature range between 30 and
                      20 K, a spin glass (SG) state is formed, representing a
                      transition state between the speromagnetic and
                      asperomagnetic states. The observed temperature evolution of
                      the magnetic ground state in the TDHET HEA upon cooling in
                      the sequence SPM→SG→ASPM is a result of
                      temperature-dependent, competing magnetic interactions. The
                      distribution of the exchange interactions shifts
                      continuously on the axis from the high-temperature SPM-type
                      with the average interaction biased towards a net negative
                      value, , through the SG-type with , to the low-temperature
                      ASPM-type with . This shift is a band-structure effect,
                      closely linked with the crystallinity of the spin system,
                      which the TDHET HEA shares with the topologically ordered
                      crystals. The probability distributions , , and are, on the
                      other hand, a consequence of chemical disorder, a property
                      that the TDHET HEA shares with the amorphous magnets. Both
                      features, the topologically ordered lattice and the
                      amorphous-type chemical disorder essentially determine the
                      magnetic state of an ideal, RE-based HEA.},
      cin          = {PGI-5 / ER-C-2},
      ddc          = {670},
      cid          = {I:(DE-Juel1)PGI-5-20110106 / I:(DE-Juel1)ER-C-2-20170209},
      pnm          = {144 - Controlling Collective States (POF3-144) / ERS TvK
                      (ZUK2) - Theodore von Kármán Fellowships (ZUK2-TvK)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-82)ZUK2-TvK},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000510971800010},
      doi          = {10.1016/j.intermet.2019.106680},
      url          = {https://juser.fz-juelich.de/record/878668},
}