Intrinsic Bulk Quantum Oscillations in a Bulk Unconventional Insulator SmB6

iScience

Máté Hartstein¹  Suchitra E. Sebastian¹  Yu-Te Hsu¹  Beng S. Tan¹  Hsu Liu¹  Monica Ciomaga Hatnean²  Geetha Balakrishnan² 

[1] Cavendish Laboratory, Cambridge University, Cambridge CB3 0HE, UK;Department of Physics, University of Warwick, Coventry CV4 7AL, UK;

关键词: Condensed Matter Physics;    Quantum Solids;    Strongly Correlated Electron Systems;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: The finding of bulk quantum oscillations in the Kondo insulator SmB6 proved a considerable surprise. Subsequent measurements of bulk quantum oscillations in other correlated insulators including YbB12 lent 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 SmB6 that 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 SmB6 and compare quantum oscillations with metallic LaB6 and 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 SmB6 with the conduction-electron Fermi surface in metallic hexaborides is at the heart of a theoretical mystery.

【 授权许可】

Unknown