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Recently, the resistance saturation at low temperature in Kondo insulatorSmB6, a long-standing puzzle in condensed matter physics, was proposed tooriginate from topological surface state. Here,we systematically studied themagnetoresistance of SmB6 at low temperature up to 55 Tesla. Both temperature-and angular-dependent magnetoresistances show a similar crossover behaviorbelow 5 K. Furthermore, the angular-dependent magnetoresistance on differentcrystal face confirms a two-dimensional surface state as the origin ofmagnetoresistances crossover below 5K. Based on two-channels model consistingof both surface and bulk states, the field-dependence of bulk gap with criticalmagnetic field (Hc) of 196 T is extracted from our temperature-dependentresistance under different magnetic fields. Our results give a consistentpicture to understand the low-temperature transport behavior in SmB6,consistent with topological Kondo insulator scenario.

Magnetoresistance evidence on surface state and field-dependent bulk gap in Kondo insulator SmB6