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• W2016647475 abstract "Samarium hexaboride has recently come under examination as a possible topological insulator. Transport measurements investigating the effects of magnetic impurities on this system uncover characteristics that are consistent with topologically insulating behaviour, and reveal a strongly suppressed bulk conductivity. Topological invariants of electron wavefunctions in condensed matter reveal many intriguing phenomena1,2. A notable example is provided by topological insulators, which are characterized by an insulating bulk coexisting with a metallic boundary state3,4. Although there has been intense interest in Bi-based topological insulators5,6, their behaviour is complicated by the presence of a considerable residual bulk conductivity7,8,9,10. Theories predict11,12 that the Kondo insulator system SmB6, which is known to undergo a transition from a Kondo lattice metal to a small-gap insulator state with decreasing temperature, could be a topological insulator. Although the insulating bulk and metallic surface separation has been demonstrated in recent transport measurements13,14,15, these have not demonstrated the topologically protected nature of the metallic surface state. Here we report thickness-dependent transport measurements on doped SmB6, and show that magnetic and non-magnetic doping results in contrasting behaviour that supports the conclusion that SmB6 shows virtually no residual bulk conductivity." @default.
• W2016647475 created "2016-06-24" @default.
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• W2016647475 date "2014-03-23" @default.
• W2016647475 modified "2023-10-12" @default.
• W2016647475 title "Topological surface state in the Kondo insulator samarium hexaboride" @default.
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• W2016647475 doi "https://doi.org/10.1038/nmat3913" @default.
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