Magnetotransport properties in a noncentrosymmetric itinerant magnet Cr$_{11}$Ge$_{19}$

摘要

We have investigated anomalous Hall effect and magnetoresistance in anoncentrosymmetric itinerant magnet Cr$_{11}$Ge$_{19}$. While the temperature-and magnetic-field-dependent anomalous Hall conductivity is just proportionalto the magnetization above 30 K, it is more enhanced in the lower temperatureregion. The magnitude of negative magnetoresistance begins to increase towardlow temperature around 30 K. The anisotropic magnetoresistance emerges atsimilar temperature. Because there is no anomaly in the temperature dependenceof magnetization around 30 K, the origin of these observations in transportproperties is ascribed to some electronic structure with the energy scale of 30K. We speculate this is caused by the spin splitting due to breaking of spatialinversion symmetry.