Observation of Quantum Oscillations in The Low Temperature Specific Heat of SmB${}_6$

Abstract

We report measurements of the low-temperature specific heat of Al-flux-grown samples of SmB${}_6$ in magnetic fields up to 32 T. Quantum oscillations periodic in $1/H$ are observed between 8 and 32 T at selected angles between [001] and [111]. The observed frequencies and their angular dependence are consistent with previous magnetic torque measurements of SmB${}_6$ but the effective masses inferred from Lifshitz-Kosevich theory are significantly larger and closer to those inferred from zero-field specific heat. Our results are thus consistent with a bulk density of states origin for the oscillations.

Main text: 6 pages, 4 figures. Supplemental: 11 pages, 6 figures