Intrinsic bulk quantum oscillations in a bulk unconventional insulator SmB${}_6$

Abstract

The finding of bulk quantum oscillations in the bulk Kondo insulator SmB${}_6$, which has been proposed to be a correlated topological insulator, proved a considerable surprise. The subsequent measurement of bulk quantum oscillations in other correlated insulators including YbB${}_{12}$ have lent support to our discovery of a class of unconventional insulators that are host to bulk quantum oscillations, of which SmB${}_6$ was the first example. Here we perform a series of experiments to examine evidence for the intrinsic character of bulk quantum oscillations in floating zone-grown single crystals of SmB${}_6$ that have been the subject of our quantum oscillation studies thus far. We present results of experiments including chemical composition analysis, magnetisation, thermal conductivity, electrical transport, and heat capacity on floating zone-grown single crystals of SmB${}_6$, and a series of quantum oscillation experiments as a function of magnetic field, temperature, and magnetic field-orientation on single crystals of floating-zone grown SmB${}_6$, LaB${}_6$, and elemental Aluminium. Results of these experimental studies establish the intrinsic origin of quantum oscillations from the bulk of pristine floating zone-grown single crystals of SmB${}_6$. The origin of the underlying bulk Fermi surface that bears close similarity with the unhybridised Fermi surface in metallic hexaborides despite the bulk insulating character of SmB${}_6$ is thus at the heart of a theoretical mystery.

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Cited by in corpus (14)

• Spin-liquid insulators can be Landau's Fermi liquids
• $f$-electron hybridised metallic Fermi surface in magnetic field-induced metallic YbB${}_{12}$
• Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB${}_6$
• Theory of Difference Frequency Quantum Oscillations
• Quantum Oscillations in the Magnetisation and Density of States of Insulators
• Bulk transport paths through defects in floating zone and Al flux grown SmB${}_6$
• Magnetoquantum Oscillations in the Specific Heat of a Topological Kondo Insulator
• Fluctuation-dominated quantum oscillations in excitonic insulators
• Quantum Oscillations in an Impurity-Band Anderson Insulator
• Emergence of electronic modes by doping Kondo insulators in the Kondo lattice and periodic Anderson models
• Temperature-driven change in band structure reflecting spin-charge separation of Mott and Kondo insulators
• A Mean-Field Study of Quantum Oscillations in Two-Dimensional Kondo Insulators
• Observation of the superconducting proximity effect from surface states in SmB${}_6$/YB${}_6$ thin film heterostructures via terahertz spectroscopy
• Persistence of correlation-driven surface states in SmB6 under pressure