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@ARTICLE{Tusche:850824,
      author       = {Tusche, Christian and Ellguth, Martin and Feyer, Vitaliy
                      and Krasyuk, Alexander and Wiemann, Carsten and Henk,
                      Jürgen and Schneider, Claus M. and Kirschner, Jürgen},
      title        = {{N}onlocal electron correlations in an itinerant
                      ferromagnet},
      journal      = {Nature Communications},
      volume       = {9},
      number       = {1},
      issn         = {2041-1723},
      address      = {London},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2018-04595},
      pages        = {3727},
      year         = {2018},
      abstract     = {Our understanding of the properties of ferromagnetic
                      materials, widely used in spintronic devices, is
                      fundamentally based on their electronic band structure.
                      However, even for the most simple elemental ferromagnets,
                      electron correlations are prevalent, requiring descriptions
                      of their electronic structure beyond the simple picture of
                      independent quasi-particles. Here, we give evidence that in
                      itinerant ferromagnets like cobalt these electron
                      correlations are of nonlocal origin, manifested in a complex
                      self-energy Σ$_σ$(E,k) that disperses as function of spin
                      σ, energy E, and momentum vector k. Together with one-step
                      photoemission calculations, our experiments allow us to
                      quantify the dispersive behaviour of the complex self-energy
                      over the whole Brillouin zone. At the same time we observe
                      regions of anomalously large “waterfall”-like band
                      renormalization, previously only attributed to strong
                      electron correlations in high-T$_C$ superconductors, making
                      itinerant ferromagnets a paradigmatic test case for the
                      interplay between band structure, magnetism, and many-body
                      correlations.},
      cin          = {PGI-6},
      ddc          = {500},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30213929},
      UT           = {WOS:000444494800011},
      doi          = {10.1038/s41467-018-05960-5},
      url          = {https://juser.fz-juelich.de/record/850824},
}