Abstract
Abstract High-resolution angle-resolved photoemission spectroscopy (HR-ARPES) has been performed on isostructural CeSb and USb to study the electronic structure near the Fermi level (E F ). In CeSb, we observed the hole and electron pockets at the Brillouin-zone (BZ) center and boundary, respectively, as well as the systematic change of the volume upon the temperature-dependent magnetic phase transition ( T N =16 K). The experimental result suggests that the p–f mixing plays an essential role in characterizing the magnetic property of semimetallic CeSb. In USb, on the other hand, we found a large electron pocket at the BZ center consisting of U 6d states and two almost dispersionless U 5f bands just below E F . This illustrates a clear difference in the electronic structure between Ce and U monopnictides as well as the character between 4f and 5f electrons.
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