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SmB6 has been predicted and verified as a prototype of topological Kondoinsulators (TKIs). Here we report longitudinal magnetoresistance and Hallcoefficient measurements on co-sputtered nanocrystalline SmB6 films and try tofind possible signatures of their topological properties. The magnetoresistance(MR) at 2 K is positive and linear (LPMR) at low field and becomes negative andquadratic at higher field. While the negative part is known from the reductionof the hybridization gap due to Zeeman splitting, the positive dependence issimilar to what has been observed in other topological insulators (TI). Weconclude that the LPMR is a characteristic feature of TI and is related to thelinear dispersion near the Dirac cone. The Hall resistance shows a sign changearound 50 K. It peaks and becomes nonlinear at around 10 K then decreases below10 K. This indicates that carriers with opposite signs emerge below 50 K. Twofilms with different geometries (thickness and lateral dimension) showcontrasting behavior below and above 50K, which proves the surface origin ofthe low temperature carriers in these films. The temperature dependence ofmagnetoresistance and the Hall data indicates that the surface states arelikely non-trivial.

Robust Surface States indicated by Magnetotransport in SmB6 Thin Films