using local and non-local Corbino disk techniques.*

Recent experiments that have been reported during the past several years suggest that samarium hexaboride (SmB₆) is a true topological Kondo insulator (TKI). Particularly, the hysteretic magnetotransport at low temperatures is a remarkable feature that seems to be consistent with the TKI picture, but distinct from other topological insulators. Motivated by the growing interest in the role of disorder and impurities in bulk SmB₆, we revisit the surface transport, including the hysteresis features, using Corbino disk structures on flux- and floating zone-grown samples with small impurity concentrations (e.g., Gd, Ni, and Fe). Also, using bulk probing techniques such as non-local (inverted) Corbino transport and heat capacity, we investigate if the bulk channel has an influence on the hysteresis signals we observe in standard transport configurations.