Evidence of momentum-dependent hybridization in Ce2Co0.8Si3.2

We studied the electronic structure of the Kondo lattice system Ce2Co0.8Si3.2 by angle-resolved photoemission spectroscopy. The spectra obtained below the coherence temperature consist of a Kondo resonance, its spin-orbit partner, and a number of dispersing bands. The quasiparticle weight related to the Kondo peak depends strongly on Fermi vectors associated with bulk bands. This indicates a highly anisotropic hybridization between conduction-band and 4f electrons-V-cf in Ce2Co0.8Si3.2.