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@ARTICLE{Medarde:57790,
      author       = {Medarde, M. and Dallera, C. and Grioni, M. and Voigt, J.
                      and Podlesnyak, A. and Pomjakushina, E. and Conder, K. and
                      Neisius, Th. and Tjernberg, O. and Barilo, S. N.},
      title        = {{L}ow-temperature spin-state transition in {L}a{C}o{O}3
                      investigated using resonant x-ray absorption at the {C}o {K}
                      edge},
      journal      = {Physical review / B},
      volume       = {73},
      number       = {5},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-57790},
      pages        = {054424},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {LaCoO3 displays two broad anomalies in the DC magnetic
                      susceptibility chi(DC), occurring, respectively, around 50 K
                      and 500 K. We have investigated the first of them within the
                      10 K < T < RT temperature range using Co K alpha(1) x-ray
                      absorption spectroscopy (XAS) in the partial fluorescence
                      yield mode. In contrast with previous O K-edge XAS reports,
                      our data show the existence of abrupt changes around 50 K
                      which can be nicely correlated with the anomaly in chi(DC).
                      To our knowledge, this is the first time that a clear,
                      quantitative relationship between the temperature dependence
                      of the magnetic susceptibility and that of the XAS spectra
                      is reported. The intensity changes in the preedge region,
                      which are consistent with a transition from a lower to a
                      higher spin state, have been analyzed using a minimal model
                      including the Co 3d and O 2p hybridization in the initial
                      state. The temperature dependence of the Co magnetic moment
                      obtained from the estimated e(g) and t(2g) occupations could
                      be satisfactorily reproduced. Also, the decrease of the Co
                      3d and O 2p hybridization by increasing temperature obtained
                      from this simple model compares favorably with the values
                      estimated from thermal evolution of the crystallographic
                      structure.},
      keywords     = {J (WoSType)},
      cin          = {IFF-ISM},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB342},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000235668300065},
      doi          = {10.1103/PhysRevB.73.054424},
      url          = {https://juser.fz-juelich.de/record/57790},
}