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- W3082936701 abstract "Motivated by the recent discovery of a large anomalous Nernst effect in ${mathrm{Co}}_{2}mathrm{Mn}mathrm{Ga}$, ${mathrm{Fe}}_{3}X$ ($X$=Al, Ga) and ${mathrm{Co}}_{3}{mathrm{Sn}}_{2}{mathrm{S}}_{2}$, we performed a first-principles study to clarify the origin of the enhancement of the transverse thermoelectric conductivity ${ensuremath{alpha}}_{ij}$ in these ferromagnets. The intrinsic contribution to ${ensuremath{alpha}}_{ij}$ can be understood in terms of the Berry curvature $mathrm{ensuremath{Omega}}$ around the Fermi level, and $mathrm{ensuremath{Omega}}$ is singularly large along nodal lines (which are gapless in the absence of the spin-orbit coupling) in the Brillouin zone. We find that not only the Weyl points but also stationary points in the energy dispersion of the nodal lines play a crucial role. The stationary points make sharp peaks in the density of states projected onto the nodal line, clearly identifying the characteristic Fermi energies at which ${ensuremath{alpha}}_{ij}$ is most dramatically enhanced. We also find that ${ensuremath{alpha}}_{ij}/T$ breaks the Mott relation and show a peculiar temperature dependence at these energies. The present results suggest that the stationary points will give us a useful guiding principle to design magnets showing a large anomalous Nernst effect." @default.
- W3082936701 created "2020-09-08" @default.
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- W3082936701 date "2020-11-23" @default.
- W3082936701 modified "2023-10-15" @default.
- W3082936701 title "Enhancement of the transverse thermoelectric conductivity originating from stationary points in nodal lines" @default.
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- W3082936701 doi "https://doi.org/10.1103/physrevb.102.205128" @default.
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