Photoemission insight into heavy-fermion behavior in YbRh2Si2.
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.
Vyalikh
D V
DV
Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
Danzenbächer
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S
Yaresko
A N
AN
Holder
M
M
Kucherenko
Yu
Y
Laubschat
C
C
Krellner
C
C
Hossain
Z
Z
Geibel
C
C
Shi
M
M
Patthey
L
L
Molodtsov
S L
SL