The electronic structure of ${\mathrm{ThPd}}_2{\mathrm{Al}}_3$, which is isostructural to the heavy fermion superconductor ${\mathrm{UPd}}_2{\mathrm{Al}}_3$, was investigated by photoelectron spectroscopy. The band structure and Fermi surfaces of ${\mathrm{ThPd}}_2{\mathrm{Al}}_3$ were obtained by angle-resolved photoelectron spectroscopy (ARPES), and the results were well explained by the band-structure calculation based on the local density approximation. The comparison between the ARPES spectra and the band-structure calculation suggests that the Fermi surface of ${\mathrm{ThPd}}_2{\mathrm{Al}}_3$ mainly consists of the $\mathrm{Al}3p$ and $\mathrm{Th}6d$ states with a minor contribution from the $\mathrm{Pd}4d$ states. The comparison of the band structures between ${\mathrm{ThPd}}_2{\mathrm{Al}}_3$ and ${\mathrm{UPd}}_2{\mathrm{Al}}_3$ argues that the $\mathrm{U}5f$ states form Fermi surfaces in ${\mathrm{UPd}}_2{\mathrm{Al}}_3$ through hybridization with the $\mathrm{Al}3p$ state in the $\mathrm{Al}$ layer, suggesting that the Fermi surface of ${\mathrm{UPd}}_2{\mathrm{Al}}_3$ has a strong three-dimensional nature.

• Received 1 December 2021
• Accepted 4 March 2022

DOI:https://doi.org/10.1103/PhysRevB.105.115128