We report on an investigation of quantum oscillations (QOs) in high field (up to 35 T) and low temperature (down to 0.5 K) in the samarium hexaboride Kondo insulator. Both high sensitivity ac-calorimetry and transport measurements have been used. We clearly observed QOs in a ${\mathrm{LaB}}_6$ single crystal used as a reference, but we did not observe any QOs in our high quality isotopically enriched ${}^{154}\mathrm{Sm}{}^{11}\mathrm{B}_6$ crystals, within our detection threshold (up to a few ${10}^5$ in specific heat at $\sim 1\mathrm{K}$, i.e., $\sim 0.05$ $\mathrm{pJ}/{\mathrm{K}}^2$). Our results rather support the hypothesis suggesting that defects in the Kondo lattice are creating metallic puddles [H. Pirie et al., Science 379, 1214 (2023)] which could be responsible for the QOs previously observed in ${\mathrm{SmB}}_6$.

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• Fermi surface
• Borides
• Complex concentrated alloys
• Quantum oscillation techniques
• Resistivity measurements
• Specific heat measurements