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Recent experiments on Kondo insulator SmB6 have revealed bulk excitationsthat could be Fermions without charge. This would lead to a residual linearterm in the thermal conductivity that was not observed universally inexperiments. To solve this mystery, we introduce a novel symmetric geometry forperforming thermal transport measurements under strains.Magnetic-field-independent residual linear terms were found in flux-grown SmB6at nominal zero strain, and they grew under a tensile strain, which is known tomodify Sm valence. A small growth-dependent difference in the Sm valence mightexplain the observed discrepancies. We discuss the constraints on the theoriesof bulk excitations in SmB6.

Enhancement of the Residual Linear Term in the Thermal Conductivity of Kondo Insulator SmB6 under Uniaxial Tensile Strain