Effect of magnetic and non-magnetic substitution in topological Kondo insulator SmB6

The topological Kondo Insulator SmB6 is believed be the first realization of a topological insulator with true bulk insulating properties that coexist with a robust conducting surface state that mounting evidence suggests is non-trivial. Here we report of a systemic study of the magnetic and non-magnetic doping effect TKI SmB6, in particular the effect of iron inclusion as well as both magnetic and non-magnetic rare earth substitution in Sm1-xRxB6. We will present our careful investigations of crystal structure, transport properties and magnetization, as well as muon spin rotation studies that together suggest a very profound effect on both the bulk and surface state properties.