We report an angle-resolved photoemission spectroscopy study of the antiferromagnetic Kondo lattice $\mathrm{Ce}{\mathrm{Pd}}_5{\mathrm{Al}}_2$, focusing on the quasi-two-dimensional $k$-space nature of its Fermi surface and, tuning photon energy to the Ce $4d–4f$ on-resonance transition, the hybridization of the Ce $4f$ state. A strong shoulder feature on the $f^0$ peak was detected, suggesting hybridization between conduction and $f$ bands. On-resonance spectra revealed narrow, yet hybridized quasiparticle bands with sharp peaks and $\sim$ 9 meV energy dispersion near the Fermi energy $E_F$. The observed dispersive hybridized $f$ band can be well described by a hybridization-band picture based on the periodic Anderson model (PAM). Hence, the $4f$ electrons in $\mathrm{Ce}{\mathrm{Pd}}_5{\mathrm{Al}}_2$ display a dual nature, with both localized and itinerant features, but with dominantly localized character.

• Received 16 November 2020
• Revised 3 February 2021
• Accepted 2 March 2021

DOI:https://doi.org/10.1103/PhysRevB.103.125122