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@ARTICLE{Nemkovskiy:824841,
      author       = {Nemkovskiy, Kirill and Kozlenko, D. P. and Alekseev, P. A.
                      and Mignot, J.-M. and Menushenkov, A. P. and Yaroslavtsev,
                      A. A. and Clementyev, E. S. and Ivanov, A. S. and Rols, S.
                      and Klobes, Benedikt and Hermann, Raphael and Gribanov, A.
                      V.},
      title        = {{E}uropium mixed-valence, long-range magnetic order, and
                      dynamic magnetic response in {E}u{C}u$_2$({S}i$_x${G}e$_{1
                      − x}$)$_2$},
      journal      = {Physical review / B},
      volume       = {94},
      number       = {19},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2016-07343},
      pages        = {195101},
      year         = {2016},
      abstract     = {In mixed-valence or heavy-fermion systems, the
                      hybridization between local f orbitals and conduction band
                      states can cause the suppression of long-range magnetic
                      order, which competes with strong spin fluctuations. Ce- and
                      Yb-based systems have been found to exhibit fascinating
                      physical properties (heavy-fermion superconductivity,
                      non-Fermi-liquid states, etc.) when tuned to the vicinity of
                      magnetic quantum critical points by use of various external
                      control parameters (temperature, magnetic field, chemical
                      composition). Recently, similar effects (mixed-valence,
                      Kondo fluctuations, heavy Fermi liquid) have been reported
                      to exist in some Eu-based compounds. Unlike Ce (Yb), Eu has
                      a multiple electron (hole) occupancy of its 4f shell, and
                      the magnetic Eu2+ state (4f7) has no orbital component in
                      the usual LS coupling scheme, which can lead to a quite
                      different and interesting physics. In the EuCu2(SixGe1−x)2
                      series, where the valence can be tuned by varying the Si/Ge
                      ratio, it has been reported that a significant valence
                      fluctuation can exist even in the magnetic order regime.
                      This paper presents a detailed study of the latter material
                      using different microscopic probes (XANES, Mössbauer
                      spectroscopy, elastic and inelastic neutron scattering), in
                      which the composition dependence of the magnetic order and
                      dynamics across the series is traced back to the change in
                      the Eu valence state. In particular, the results support the
                      persistence of valence fluctuations into the
                      antiferromagnetic state over a sizable composition range
                      below the critical Si concentration xc≈0.65. The sequence
                      of magnetic ground states in the series is shown to reflect
                      the evolution of the magnetic spectral response.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      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)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000386617700001},
      doi          = {10.1103/PhysRevB.94.195101},
      url          = {https://juser.fz-juelich.de/record/824841},
}