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Logarithmic criticality in transverse thermoelectric conductivity of the ferromagnetic topological semimetal CoMnSb
Physical Review B  (IF4.036),  Pub Date : 2021-10-25, DOI: 10.1103/physrevb.104.l161114
Hiroto Nakamura, Susumu Minami, Takahiro Tomita, Agustinus Agung Nugroho, Satoru Nakatsuji

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.