Electronic structures of UTSn (T=Ni, Pd) using photoemission spectroscopy

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The electronic structures of the localized 5f systems UTSn (T=Ni, Pd) have been investigated using photoemission spectroscopy (PES). The extracted U 5f PES spectra of UTSn (T=Ni, Pd) exhibit a broad peak centered at 0.3 eV below EF with rather small spectral weight near EF (Nf(EF)). The small Nf(EF) in UTSn is found to be correlated with the T d PES spectra that have a very low density of states (DOS) near EF. The high-resolution PES spectra for UTSn provide the V-shaped reduced metallic DOS near EF but do not reveal any appreciable changes in their electronic structures across the magnetic phase transitions. A possible origin for the reduced Nf(EF) in UTSn is ascribed to the hybridization to the very low T d DOS at EF. Comparison of the measured PES spectra to the LSDA+U band structure calculation reveals a reasonably good agreement for UPdSn, but not so for UNiSn.