Evidence for quasilocalized 5f electronic states in USbxTe1-x

We have studied the "5f, 6d" electron states of the system USbxTe1-x (100) using photoemission spectroscopy with synchrotron radiation. In contrast with the generally accepted picture of uranium chalcogenides and pnictides, we find for UTe that the main 5f level lies 0.75 eV below EF rather than at EF and that 6d states exist at EF. Our results may be explained with a model having a correlated quasilocalized 5f3-δ(δ=0-0.5) level resonant with broader 6d bands rather than bandlike 5f levels. © 1981 The American Physical Society.