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A Kondo lattice of strongly interacting f-electrons immersed in a sea ofconduction electrons remains one of the unsolved problems in condensed matterphysics. The problem concerns localized f-electrons at high temperatures whichevolve into hybridized heavy quasi-particles at low temperatures, resulting inthe appearance of a hybridization gap. Here, we unveil the presence ofhybridization gap in Ce2RhIn8 and find the surprising result that thetemperature range at which this gap becomes visible by angle-resolvedphotoemission spectroscopy is nearly an order of magnitude lower than thetemperature range where the magnetic scattering becomes larger than the phononscattering, as observed in the electrical resistivity measurements. Furthermorethe spectral gap appears at temperature scales nearly an order of magnitudehigher than the coherent temperature. We further show that when replacing In byCd to tune the local density of states at the Ce3+ site, there is a strongreduction of the hybridization strength, which in turn leads to the suppressionof the hybridization gap at low temperatures.

Unveiling the hybridization gap in Ce2RhIn8 heavy fermion compound