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@ARTICLE{Agustsson:455266,
      author       = {Agustsson, Steinn Ymir and Chernov, Sergey V. and Medjanik,
                      Katerina and Babenkov, Sergey and Fedchenko, Olena and
                      Vasilyev, Dmitry and Schlueter, Christof and Gloskovskii,
                      Andrei and Matveev, Yury and Kliemt, Kristin and Krellner,
                      Cornelius and Demsar, Jure and Schoenhense, Gerd and Elmers,
                      Hans-Joachim},
      title        = {{T}emperature-{D}ependent {C}hange of the {E}lectronic
                      {S}tructure in the {K}ondo {L}attice {S}ystem
                      ${Y}b{R}h_{2}{S}i_{2}$},
      journal      = {Journal of physics / Condensed matter},
      volume       = {00},
      number       = {00},
      issn         = {1361-648X},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PUBDB-2021-01002},
      pages        = {1-20},
      year         = {2021},
      abstract     = {The heavy-fermion behavior in intermetallic compounds
                      manifests itself in a quenching of local magnetic moments by
                      developing Kondo spin-singlet many-body states combined with
                      a drastic increase of the effective mass of conduction
                      electrons, which occurs below the lattice Kondo temperature
                      $T_K$. This behavior is caused by interactions between the
                      strongly localized 4f electrons and itinerant electrons. A
                      controversially discussed question in this context is how
                      the localized electronic states contribute to the Fermi
                      surface upon changing the temperature. One expects that
                      hybridization between the local moments and the itinerant
                      electrons leads to a transition from a small Fermi surface
                      in a non-coherent regime at high temperatures to a large
                      Fermi surface once the coherent Kondo lattice regime is
                      realized below $T_K$. We demonstrate, using hard X-ray
                      angle-resolved photoemission spectroscopy that the
                      electronic structure of the prototypical heavy fermion
                      compound YbRh$_2$Si$_2$ changes with temperature between 100
                      and 200 K, i.e. far above the Kondo temperature of this
                      system. Our results suggest a transition from a small to a
                      large Fermi surface with decreasing temperature. This result
                      is inconsistent with the prediction of the dynamical
                      mean-field periodic Anderson model and supports the idea of
                      an independent energy scale governing the change of band
                      dispersion.},
      organization  = {(Deutschland)},
      cin          = {DOOR ; HAS-User / FS-PET-S},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20190579 (I-20190579)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20190579},
      experiment   = {EXP:(DE-H253)P-P22-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:33561846},
      UT           = {WOS:000644686800001},
      doi          = {10.1088/1361-648X/abe479},
      url          = {https://bib-pubdb1.desy.de/record/455266},
}