Robustness of the Insulating Bulk in the Topological Kondo Insulator SmB${}_6$

Abstract

We used the inverted resistance method to extend the bulk resistivity of SmB${}_6$ to a regime where the surface conduction overwhelms the bulk. Remarkably, the bulk resistivity shows an intrinsic thermally activated behavior that changes ten orders of magnitude, suggesting that it is an ideal insulator that is immune to disorder. Non-stoichiometrically-grown SmB${}_6$ samples also show an almost identical thermally activated behavior. At low temperatures, however, these samples show a mysterious high bulk resistivity plateau, which may arise from extended defect conduction in a 3D TI.

References in corpus (27)

• Topological Insulator Materials
• Topological Band Theory for Non-Hermitian Hamiltonians
• Topological Kondo Insulators
• Helical Metal Inside a Topological Band Insulator
• Low-temperature surface conduction in the Kondo insulator SmB${}_6$
• Robust Surface Hall Effect and Nonlocal Transport in SmB6: Indication for an Ideal Topological Insulator
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• Mixed-valence insulators with neutral Fermi surfaces
• Skyrme insulators: insulators at the brink of superconductivity
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• Weak Antilocalization and Linear Magnetoresistance in The Surface State of SmB6
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• Magnetotransport Measurements of the Surface States of Samarium Hexaboride using Corbino Structures
• Magnetic and defect probes of the SmB${}_6$ surface state
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Cited by in corpus (26)

• Properties of the donor impurity band in mixed valence insulators
• Visualizing the atomic-scale origin of metallic behavior in Kondo insulators
• Definitive Surface Magnetotransport Study of SmB${}_6$
• Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB${}_6$
• Resistivity saturation in Kondo insulators
• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Magnetic impurities in Kondo insulators: An application to samarium hexaboride
• Probing FeSi, a d-electron topological Kondo insulator candidate, with magnetic field, pressure, and microwaves
• Intrinsic Low-Temperature Magnetism in SmB6
• Fragility of the Kondo insulating gap against disorder: relevance to recent puzzles in topological Kondo insulators
• Bulk transport paths through defects in floating zone and Al flux grown SmB${}_6$
• Robust surface states and coherence phenomena in magnetically alloyed SmB6
• Extraordinary Bulk Insulating Behavior in the Strongly Correlated Materials FeSi and FeSb${}_2$
• Comparative Scanning Tunneling Microscopy Study on Hexaborides
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Realizing a topological diode effect on the surface of a topological Kondo insulator
• Microwave Meissner Screening of Proximity coupled Topological Insulator / Superconductor Bilayers
• Phase stability in SmB${}_6$
• Slow crystalline electric field fluctuations in the Kondo lattice SmB${}_6$
• Surface excitations relaxation in the Kondo insulator Sm${}_{1-x}$Gd${}_x$B${}_6$
• Persistence of correlation-driven surface states in SmB6 under pressure
• Observation of the superconducting proximity effect from surface states in SmB${}_6$/YB${}_6$ thin film heterostructures via terahertz spectroscopy
• Revisiting the Possible 4f7 5d1 Ground State of Gd Impurities in SmB6 by Electron Spin Resonance
• Mapping out the emergence of topological features in the highly alloyed topological Kondo insulators Sm${}_{1-x}{M}_x$B${}_6$ ($M$=Eu, Ce)
• Intrinsic one-dimensional conducting channels in the Kondo insulator SmB6
• Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator