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@ARTICLE{Vrtnik:141269,
      author       = {Vrtnik, S. and Jazbec, S. and Jagodic, M. and Korelec, A.
                      and Hosnar, H. and Jaglicic, Z. and Jeglic, P. and
                      Feuerbacher, Michael and Mizutani, U. and Dolinsek, J.},
      title        = {{S}tabilization mechanism of γ-{M}g 17 {A}l 12 and β-{M}g
                      2 {A}l 3 complex metallic alloys},
      journal      = {Journal of physics / Condensed matter},
      volume       = {25},
      number       = {42},
      issn         = {1361-648X},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2013-06463},
      pages        = {425703 -},
      year         = {2013},
      abstract     = {Large-unit-cell complex metallic alloys (CMAs) frequently
                      achieve stability by lowering the kinetic energy of the
                      electron system through formation of a pseudogap in the
                      electronic density of states (DOS) across the Fermi energy
                      εF. By employing experimental techniques that are sensitive
                      to the electronic DOS in the vicinity of εF, we have
                      studied the stabilization mechanism of two binary CMA phases
                      from the Al–Mg system: the γ-Mg17Al12 phase with 58 atoms
                      in the unit cell and the β-Mg2Al3 phase with 1178 atoms in
                      the unit cell. Since the investigated alloys are free from
                      transition metal elements, orbital hybridization effects
                      must be small and we were able to test whether the alloys
                      obey the Hume-Rothery stabilization mechanism, where a
                      pseudogap in the DOS is produced by the Fermi
                      surface–Brillouin zone interactions. The results have
                      shown that the DOS of the γ-Mg17Al12 phase exhibits a
                      pronounced pseudogap centered almost exactly at εF, which
                      is compatible with the theoretical prediction that this
                      phase is stabilized by the Hume-Rothery mechanism. The
                      disordered cubic β-Mg2Al3 phase is most likely entropically
                      stabilized at high temperatures, whereas at lower
                      temperatures stability is achieved by undergoing a
                      structural phase transition to more ordered rhombohedral β'
                      phase at 214 ° C, where all atomic sites become fully
                      occupied. No pseudogap in the vicinity of εF was detected
                      for the β' phase on the energy scale of a few 100 meV as
                      determined by the 'thermal observation window' of the
                      Fermi–Dirac function, so that the Hume-Rothery
                      stabilization mechanism is not confirmed for this compound.
                      However, the existence of a much broader shallow pseudogap
                      due to several critical reciprocal lattice vectors
                      $\buildrel{\rightharpoonup}\over{G} $ that simultaneously
                      satisfy the Hume-Rothery interference condition remains the
                      most plausible stabilization mechanism of this phase. At Tc
                      = 0.85 K, the β' phase undergoes a superconducting
                      transition, which slightly increases the cohesive energy and
                      may contribute to relative stability of this phase against
                      competing neighboring phases.},
      cin          = {PGI-5},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000325337700016},
      doi          = {10.1088/0953-8984/25/42/425703},
      url          = {https://juser.fz-juelich.de/record/141269},
}