We report the results of our experimental studies on the magnetic, transport, and thermoelectric properties of the ferromagnetic metal CoMnSb. A sizable anomalous Hall conductivity ${\sigma }_{yx}$ and transverse thermoelectric conductivity ${\alpha }_{yx}$ are found experimentally and comparable in size to the values estimated from first-principles calculation. Our experiment further reveals that CoMnSb exhibits $-TlogT$ critical behavior in ${\alpha }_{yx}\left(T\right)$, deviating from Fermi liquid behavior ${\alpha }_{yx}\sim T$ over a decade of temperature between 10 and 400 K, similar to ferromagnetic Weyl and nodal-line semimetals. Our theoretical calculation for CoMnSb also predicts the $-TlogT$ behavior when the Fermi energy locates near the Weyl nodes in momentum space.

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• Topological materials
• Ferromagnets
• Thermoelectrics
• Weyl semimetal
• First-principles calculations
• Wannier function methods