Anomalous Hall effect in an antiferromagnetic CeGaSi single crystal

作者：J. X. Gong, Huan Wang, Kun Han, Xiangyu Zeng, Xiao-Ping Ma, Yi-Ting Wang, Jun-Fa Lin, Xiaoyan Wang, Tian‐Long Xia · 发表于：Physical review. B./Physical review. B · 年份：2024 · DOI：10.1103/physrevb.109.024434 · 被引用次数：13 · 研究领域：Rare-earth and actinide compounds、Magnetic and transport properties of perovskites and related materials、Magnetic properties of thin films

We report a detailed investigation of the magnetic and electrical transport properties in an antiferromagnetic CeGaSi crystal. It orders ferromagnetically within the $ab$ plane and antiferromagnetically along the $c$ axis below ${T}_{N}\phantom{\rule{0.28em}{0ex}}(\ensuremath{\sim}12\phantom{\rule{0.16em}{0ex}}\mathrm{K})$. The magnetotransport in CeGaSi shows anisotropy with the emergence of negative magnetoresistance (MR) within the $ab$ plane and along the $c$ axis. At low temperatures, the initially negative MR within the $ab$ plane changes sign and becomes positive with $B$ further increasing and approaching saturation. When the field is applied along the $c$ axis, the MR remains negative, as a result of the suppression of spin scattering in the antiferromagnetic state. Interestingly, different Hall responses are also demonstrated. A prominent anomalous Hall effect (AHE) is observed with $B\ensuremath{\parallel}ab$ in CeGaSi with a maximum value of anomalous Hall conductivity $|{\ensuremath{\sigma}}_{xz}^{A}|\ensuremath{\sim}128\phantom{\rule{4pt}{0ex}}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$. The scaling behaviors of anomalous Hall resistivity and conductivity indicate the skew scattering as the dominant mechanism of AHE in CeGaSi. However, the AHE is absent and only the normal Hall effect is observed with $B\ensuremath{\parallel}c$. These fascinating findings in MR and Hall measurements not only establ...