k Dependence of the Crystal-Field Splittings of 4f States in Rare-Earth Systems

Research output: Contribution to journalResearch articleContributedpeer-review


  • D. V. Vyalikh - , Chair of Surface Physics (Author)
  • S. Danzenbaecher - , Chair of Surface Physics (Author)
  • Yu. Kucherenko - , TUD Dresden University of Technology, National Academy of Sciences of Ukraine (Author)
  • K. Kummer - , TUD Dresden University of Technology (Author)
  • C. Krellner - , Max Planck Society, Social Neurosci Lab (Author)
  • C. Geibel - , Max Planck Society, Social Neurosci Lab (Author)
  • M. G. Holder - , TUD Dresden University of Technology (Author)
  • T. K. Kim - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • C. Laubschat - , Chair of Surface Physics (Author)
  • M. Shi - , Paul Scherrer Institute (Author)
  • L. Patthey - , ETH Zurich (Author)
  • R. Follath - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • S. L. Molodtsov - , TUD Dresden University of Technology, European XFEL (Author)


The occupation, energy separation, and order of the crystal-field-split 4f states are crucial for the understanding of the magnetic properties of rare-earth systems. We provide the experimental evidence that crystal-field-split 4f states exhibit energy dispersion in momentum space leading to variations of energy spacings between them and even of their energy sequence across the Brillouin zone. These observations were made by performing angle-resolved photoemission experiments on YbRh2Si2 and properly simulated within a simple model based on results obtained by inelastic neutron scattering experiments and band structure calculations. Our findings should be generally applicable to rare-earth systems and have considerable impact on the understanding of magnetism and related phenomena.


Original languageEnglish
Article number237601
Number of pages4
JournalPhysical review letters
Issue number23
Publication statusPublished - 3 Dec 2010

External IDs

PubMed 21231502
Scopus 78649834347



  • Quantum criticality, Excitations, Ybrh2si2