  The Kondo resonance at the Fermi level is well-established for the electronic
structure of Ce (f1 electron) and Yb (f1 hole) based systems. In this work, we
report complementary experimental and theoretical studies on the Kondo
resonance in Pr-based f2 system, PrTi2Al20. Using Pr 3d-4f resonant
photoemission spectroscopy and single impurity Anderson model (SIAM)
calculations including the full multiplets of Pr ions, we show that an f2
system can also give rise to a Kondo resonance at the Fermi level. The Kondo
resonance peak is experimentally observed through a final-state-multiplet
dependent resonance and is reproduced with properly tuned hybridization
strength in SIAM calculations.
