1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190
Abstract：We report on low-temperature electron transport properties of MnSb$_{2}$Te$_{4}$, a candidate of ferrimagnetic Weyl semimetal. Long-range magnetic order is manifested as a nearly square-shaped hysteresis loop in the anomalous Hall resistance, as well as sharp jumps in the magnetoresistance. At temperatures below 4 K, a ${\rm ln}T$-type upturn appears in the temperature dependence of longitudinal resistance, which can be attributed to the electron-electron interaction (EEI), since the weak localization can be excluded by the temperature dependence of magnetoresistance. Although the anomalous Hall resistance exhibits a similar ${\rm ln}T$-type upturn in the same temperature range, such correction is absent in the anomalous Hall conductivity. Our work demonstrates that MnSb$_{2}$Te$_{4}$ microflakes provide an ideal system to test the theory of EEI correction to the anomalous Hall effect.
Throughout this work, $R_{xx}$ refers to the sheet longitudinal resistance per square. The corresponding longitudinal resistivity is $\rho_{xx}$=$R_{xx}t$, where $t$ is the sample thickness
This approximation is valid because $R_{xx}$ is two orders of magnitude larger than $R_{\rm AH }$in MnSb$_{2}$Te$_{4}$. In this work, the AH conductivity $\sigma_{\mathrm{AH}}$ refers to the sheet conductance per square, and hence has a dimension of inverse resistance. It is convenient for discussing the physics at two dimensions.
2020, Vol. 37 
