摘要：SummaryThe finding of bulk quantum oscillations in the Kondo insulator SmB6proved a considerable surprise. Subsequent measurements of bulk quantum oscillations in other correlated insulators including YbB12lent support to our discovery of a class of bulk unconventional insulators that host bulk quantum oscillations. 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 SmB6that have been the subject of our quantum oscillation studies. We present results of thermodynamic, transport, and composition analysis experiments on pristine floating zone-grown single crystals of SmB6and compare quantum oscillations with metallic LaB6and elemental aluminum. These results establish the intrinsic origin of quantum oscillations from the insulating bulk of floating zone-grown SmB6. The similarity of the Fermi surface in insulating SmB6with the conduction-electron Fermi surface in metallic hexaborides is at the heart of a theoretical mystery.Graphical AbstractDisplay OmittedHighlights•No metallic inclusion contribution to quantum oscillations in ultrapure insulating SmB6•Unconventional low energy excitations responsible for bulk quantum oscillations in SmB6•Insulating SmB6Fermi surface resembles conduction-e-Fermi surface of metallic LaB6Condensed Matter Physics; Quantum Solids; Strongly Correlated Electron Systems
