Comparative study of the electronic structure of XRu2Si2: probing the Anderson lattice

dThe k-resolved single particle excitations, as determined by angle-resolve d photoemission spectroscopy (ARPES), are compared and contrasted for, LaRu 2Si2, CeRu2Si2, ThRu2Si2, and URu2Si2, isostructural layered compounds with differing nominal f-occupations of f(0), f(1), f(0), and f(2), respectivel y. ARPES measurements include 4d and Sd-edge resonant photoemission to dist inguish S-character and Fermi-energy intensity mapping of Fermi surface con tours. Comparison to RLAPW band structure calculations shows very good agre ement of the d-band structure away from E-j. Discrepancies in the near E-j region highlight k-dependent effects of f-correlation and f-d hybridization . Approximately equal dimensions of Fermi contours for X = (La, Ce) suggest the exclusion of 4f electrons from the CeRu2Si2 Fermi surface at temperatu res far above the Kondo temperature. High-resolution spectra for X= (Ce, U) allow comparison of f-d mixing to predictions of the Anderson lattice mode l. Published by Elsevier Science B.V.