Anomalous Hall Effect in Ge1-x-yPbxMnyTe Composite System

The purpose of this study was to investigate the magnetotransport properties of the Ge0.743Pb0.183Mn0.074Te mixed crystal. The results of magnetization measurements indicated that the compound is a spin-glass-like diluted magnetic semiconductor with critical temperature TSG = 97.5 K. Nanoclusters in the sample are observed. Both, matrix and clusters are magnetically active. Resistivity as a function of temperature has a minimum at 30 K. Below the minimum a variable-range hopping is observed, while above the minimum a metallic-like behavior occurs. The crystal has high hole concentration, p = 6.6× 10 cm−3, temperature-independent. Magnetoresistance amplitude changes from 0.78 to 1.18% with increase of temperature. In the magnetotransport measurements we observed the anomalous Hall e ect with hysteresis loops. Calculated anomalous Hall e ect coe cient, RS = 2.0× 10 m/C, is temperature independent. The analysis indicates the extrinsic skew scattering mechanism to be the main physical mechanism responsible for anomalous Hall e ect in Ge0.743Pb0.183Mn0.074Te alloy.