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Recently there have been increasingly hot debates on whether a bulk Fermisurface of charge-neutral excitations exists in the topological Kondo insulatorSmB6. To unambiguously resolve this issue, we performed the low-temperaturethermal conductivity measurements of a high-quality SmB6 single crystal down to0.1 K and up to 14.5 T. Our experiments show that the residual linear term ofthermal conductivity at zero field is zero, within the experimental accuracy.Furthermore, the thermal conductivity is insensitive to magnetic field up to14.5 T. These results exclude the existence of fermionic charge-neutralexcitations in bulk SmB6, such as scalar Majorana fermions or spinons, thus puta strong constraint on the explanation of the quantum oscillations observed inSmB6.

Bulk Fermi surface of charge-neutral excitations in SmB6 or not: a heat-transport study