Logarithmic criticality in transverse thermoelectric conductivity of the ferromagnetic topological semimetal CoMnSb,Physical Review B

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Logarithmic criticality in transverse thermoelectric conductivity of the ferromagnetic topological semimetal CoMnSb
Physical Review B ( IF 3.2 ) Pub Date : 2021-10-25 , DOI: 10.1103/physrevb.104.l161114
Hiroto Nakamura ₁ , Susumu Minami ₂ , Takahiro Tomita _{1,

3} , Agustinus Agung Nugroho ₄ , Satoru Nakatsuji _{1,

2,

3,

5,

6}

Affiliation

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

σ_{y x}

and transverse thermoelectric conductivity

α_{y x}

are found experimentally and comparable in size to the values estimated from first-principles calculation. Our experiment further reveals that CoMnSb exhibits

- T log T

critical behavior in

α_{y x} (T)

, deviating from Fermi liquid behavior

α_{y x} \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