ARPES IN STRONGLY CORRELATED 4F AND 5F SYSTEMS - COMPARISON TO THE PERIODIC ANDERSON MODEL (PAM)

The electronic structure of both Ce and U heavy fermions appears to co nsist of extremely narrow, nearly temperature-independent bands (i.e., no spectral weight loss or transfer with temperature). A small disper sion of the f-bands above the Kondo temperature is easily measurable s o that a Kondo resonance, as defined by NCA, is not evident. Prelimina ry results, however, indicate that the Periodic Anderson Model (PAM) c aptures some of the essential physics. Angle-integrated resonant photo emission results on delta-Pu indicate a narrow 5f feature at E-F, simi lar in width to f-states in Ce and U compounds, but differing in that PES cross-section as a function of h nu suggests substantial 6d admixt ure. (C) 1998 Elsevier Science S.A.