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  • Title: Photoemission insight into heavy-fermion behavior in YbRh2Si2.
    Author: Vyalikh DV, Danzenbächer S, Yaresko AN, Holder M, Kucherenko Y, Laubschat C, Krellner C, Hossain Z, Geibel C, Shi M, Patthey L, Molodtsov SL.
    Journal: Phys Rev Lett; 2008 Feb 08; 100(5):056402. PubMed ID: 18352399.
    Abstract:
    As shown by angle-resolved photoemission (PE), hybridization of bulk Yb 4f(2+) states with a shallow-lying valence band of the same symmetry leads in YbRh2Si2 to dispersion of a 4f PE signal in the region of the Kondo resonance with a Fermi-energy crossing close to Gamma[over ]. Additionally, renormalization of the valence state results in the formation of a heavy band that disperses parallel to the 4f originating signal. The symmetry and character of the states are probed by circular dichroism and the photon-energy dependence of the PE cross sections.
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