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@ARTICLE{Alekseev:20759,
      author       = {Alekseev, P.A. and Mignot, J.-M. and Nemkovski, K.S. and
                      Rybina, A.V. and Lazukov, V.N. and Ivanov, A.S. and Iga, F.
                      and Takabatake, T.},
      title        = {{I}nterplay of low-energy phonons and magnetiv excitations
                      in the {K}ondo insulator {Y}b{B}12},
      journal      = {Journal of physics / Condensed matter},
      volume       = {24},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-20759},
      pages        = {205601},
      year         = {2012},
      note         = {We are grateful to D Reznik for fruitful discussions and to
                      the LLB and ILL for hospitality during the experiments.
                      Financial support from RFBR grants 08-02-00430 and
                      11-02-00121 is highly appreciated.},
      abstract     = {Peculiarities in the lattice dynamics of the Kondo
                      insulator Y bB(12) have been studied by inelastic neutron
                      scattering. Selected phonon modes were traced above and
                      below the temperature region (T ~ 50 K) where the gap opens
                      in the electron density of states. The intensities of some
                      low-energy modes exhibit an anomalous temperature dependence
                      for q vectors close to the Brillouin zone boundary,
                      suggesting a renormalization of the phonon eigenvectors.
                      This effect is thought to arise from a coupling with
                      magnetic excitations of the same symmetry, which exist at
                      nearby energies. It is argued that this magnetovibrational
                      coupling may in turn play a role in the steep temperature
                      crossover existing in Y bB(12) between the low-temperature
                      (Kondo insulator) and high-temperature (incoherent
                      spin-fluctuation) regimes, which is rapidly suppressed by
                      lighter Zr substitution.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-4-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien
                      (FUEK412) / 544 - In-house Research with PNI (POF2-544)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-HGF)POF2-544},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22510752},
      UT           = {WOS:000303507100010},
      doi          = {10.1088/0953-8984/24/20/205601},
      url          = {https://juser.fz-juelich.de/record/20759},
}