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@ARTICLE{Arndt:15666,
      author       = {Arndt, J. and Stockert, O. and Schmalzl, K. and Faulhaber,
                      E. and Jeevan, H. S. and Geibel, C. and Schmidt, W. and
                      Loewenhaupt, M. and Steglich, F.},
      title        = {{S}pin fluctuations in normal state {C}e{C}u2{S}i2 on
                      approaching the quantum critical point},
      journal      = {Physical review letters},
      volume       = {106},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-15666},
      year         = {2011},
      note         = {We greatly acknowledge helpful discussions with S. Kirchner
                      and Q. Si. This work was supported by the Deutsche
                      Forschungsgemeinschaft through Forschergruppe 960 "Quantum
                      phase transitions."},
      abstract     = {We report on the magnetic excitation spectrum in the normal
                      state of the heavy-fermion superconductor CeCu2Si2 on
                      approaching the quantum critical point (QCP). The magnetic
                      response in the superconducting state is characterized by a
                      transfer of spectral weight to energies above a spin
                      excitation gap. In the normal state, a slowing-down of the
                      quasielastic magnetic response is observed, which conforms
                      to the scaling expected for a QCP of spin-density-wave type.
                      This interpretation is substantiated by an analysis of
                      specific heat data and the momentum dependence of the
                      magnetic excitation spectrum. Our study represents the first
                      direct observation of an almost critical slowing-down of the
                      normal state magnetic response at a QCP when suppressing
                      superconductivity. The results strongly imply that the
                      coupling of Cooper pairs in CeCu2Si2 is mediated by
                      overdamped spin fluctuations.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JCNS-2 / JARA-FIT},
      ddc          = {550},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
      shelfmark    = {Physics, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000291608700005},
      doi          = {10.1103/PhysRevLett.106.246401},
      url          = {https://juser.fz-juelich.de/record/15666},
}