We report high-resolution angle-resolved photoemission spectroscopy (HR ARPES) on single-crystal ${\mathrm{UPt}}_3$ together with a full-potential linearized augmented-plane-wave band-structure calculation for comparison. The experimental results show a narrow dispersionless U $5f$ band at $E_F$ and highly dispersive Pt $5d$ bands at higher binding energies. The observed U $5f$ band shows a systematic intensity variation in accordance with the crystal momentum, but is much narrower than the calculation, while the Pt $5d$ bands show a good quantitative agreement between the experiment and calculation. The present HR-ARPES observation suggests a substantial renormalization effect of the U $5f$ band due to the strong correlation.

• Received 24 August 1998

DOI:https://doi.org/10.1103/PhysRevB.59.8923