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We report the results of our experimental studies on the magnetic, transportand thermoelectric properties of the ferromagnetic metal CoMnSb. Sizableanomalous Hall conductivity $\sigma_{yx}$ and transverse thermoelectricconductivity $\alpha_{yx}$ are found experimentally and comparable in size tothe values estimated from density-functional theory. Our experiment furtherreveals that CoMnSb exhibits $-T\ln T$ critical behavior in $\alpha_{yx}(T)$,deviating from Fermi liquid behavior $\alpha_{yx}\sim T$ over a decade oftemperature between 10 K to 400 K, similar to ferromagnetic Weyl and nodal-linesemimetals. Our theoretical calculation for CoMnSb also predicts the $-T\ln T$behavior when the Fermi energy locates near the Weyl nodes in momentum space.

Logarithmic Criticality in Transverse Thermoelectric Conductivity of the Ferromagnetic Topological Semimetal CoMnSb