Enhanced Anomalous Nernst Effect by Tuning the Chemical Potential in the Topological Kagome Ferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mi>Fe</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Yupeng Li, Jingang Zhou, Miaocong Li, Lei Qiao, Chenxi Jiang, Qiming Chen, Yuke Li, Tao Qian, Zhu‐An Xu
Abstract
Large anomalous Nernst effect (ANE) in magnetic topological materials (MTMs) has attracted various attentions because of its potential thermoelectric applications. Recently, MTMs with the kagome lattice have become a focus of research to investigate enhanced ANE. In this work, the ANE (${S}_{yx}^{A}$) at room temperature in a kagome ferromagnet ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ with massive Dirac bands is greatly enhanced to $5.44\phantom{\rule{0.2em}{0ex}}\ensuremath{\mu}{\mathrm{VK}}^{\ensuremath{-}1}$ when its Fermi level is gradually tuned to Dirac nodal points. Then the intrinsic contributions to the enhanced ${S}_{yx}^{A}$ is further investigated. The anomalous transverse Peltier conductivity ${\ensuremath{\alpha}}_{yx}^{A}$ shows the linear temperature-dependent behavior, which is consistent with Berry-curvature-contributed ${\ensuremath{\alpha}}_{yx}^{A}$, and this behavior is different from temperature-dependent variation of magnetization. Combined with theoretic calculations, the ${\ensuremath{\alpha}}_{yx}^{A}$ and $|{\ensuremath{\alpha}}_{yx}^{A}/{\ensuremath{\sigma}}_{xy}^{A}|$ ratio increases significantly when approaching the massive Dirac cone, indicating that the massive Dirac dispersion and intrinsic contributions play a role in enhanced ANE instead of the side-jump mechanism. Our work demonstrates an effective universal approach to enhance ANE in such MTMs.