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The intermediate valence compound YbAl$_3$ is known to undergo ahybridization process between itinerant and localized electrons. The resultingheavy Fermi liquid remains non-magnetic and non-superconducting. A microscopicunderstanding of the hybridization process in YbAl$_3$ is still lackingalthough some characteristic temperature and energy scales have beenidentified. Here we report results from novel spectroscopic measurements basedon quasiparticle scattering. From the conductance spectra taken over a widetemperature range, we deduce that the band renormalization and hybridizationprocess begins around 110 K, causing the conductance enhancement with a Fanobackground. This temperature, a new scale found in this work, is much higherthan the coherence temperature (34 K). Our observation is in agreement with theslow crossover scenario discussed recently in the literature. The indirecthybridization gap appears to open concomitantly with the emergence of acoherent Fermi liquid. Thus, we suggest its measurement as a more rigorous wayto define the coherence temperature than just taking the temperature for aresistivity peak.

Hybridization and Slow Coherence Crossover in the Intermediate Valence Compound YbAl$_3$ via Quasiparticle Scattering Spectroscopy