Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
arXiv:1403.1462 · doi:10.1103/PhysRevX.4.031012
Abstract
Topological insulators are materials characterized by dissipationless, spin-polarized surface states resulting from non-trivial band topologies. Recent theoretical models and experiments suggest that SmB6 is the first topological Kondo insulator, in which the topologically non-trivial band structure results from electron-electron interactions via Kondo hybridization. Here, we report that the surface conductivity of SmB6 increases systematically with bulk carbon content. Further, addition of carbon is linked to an increase in n-type carriers, larger low temperature electronic contributions to the specific heat with a characteristic temperature scale of T* = 17 K, and a broadening of the crossover to the insulating state. Additionally, X-ray absorption spectroscopy shows a change in Sm valence at the surface. Our results highlight the importance of phonon dynamics in producing a Kondo insulating state and demonstrate a correlation between the bulk thermodynamic state and low temperature resistance of SmB6.
References in corpus (3)
- Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
- Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
- Topological invariants, surface states, and interaction-driven phase transitions in correlated Kondo insulators with cubic symmetry
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