Electronic structure study of the intermetallic compound GdRhIn₅

Heavy-fermion compounds frequently host emergent phases — most notably non-BCS superconductivity and unconventional quantum criticality — whose microscopic origins can invariably be traced to the entanglement of itinerant and nearly localized electronic degrees of freedom. In this work, we carry out a systematic study on the electronic structure and quasiparticle features of the antiferromagnetic intermetallic compound GdRhIn₅, utilizing high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements. Energy-dependent measurements reveal the coexistence of Fermi surface topologies with both quasi-two-dimensional and three-dimensional characteristics. Notably, the quasiparticle bands commonly observed in conventional cerium-based compounds are absent from the resonance data, likely due to the strong localization nature of the Gd 4f states within the compound. Temperature-dependent studies, combined with density functional theory (DFT) calculations, demonstrate that as temperature decreases, the electronic density of states (EDC) near the Fermi level increases, while the peak position of the MDC associated with the β energy band shows a shrinking trend. This systematic exploration of GdRhIn₅’s electronic structure enhances our comprehension of the microscopic physical properties not only of GdRhIn₅ but also of the broader family of rare-earth-based 115 systems.