1. Anomalous Hall effect and magnetoresistance in Ge 1−x−y Pb x Mn y Te cluster-glass system
- Author
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R. Szymczak, M. Górska, Anna Reszka, E.I. Slynko, B. Brodowska, Bogdan J. Kowalski, Lukasz Kilanski, Viktor Domukhovski, A. Podgórni, V. E. Slyn’ko, and Witold Dobrowolski
- Subjects
010302 applied physics ,Condensed matter physics ,Magnetoresistance ,Chemistry ,Scattering ,Mechanical Engineering ,Metals and Alloys ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Hysteresis ,Ferromagnetism ,Mechanics of Materials ,Hall effect ,Electrical resistivity and conductivity ,0103 physical sciences ,Materials Chemistry ,Cluster (physics) ,0210 nano-technology ,Chemical composition - Abstract
We present studies of magnetotransport properties of Ge 1− x − y Pb x Mn y Te bulk crystals with chemical composition changing from 0.180 x y T SG around 90 K. The presence of strong anomalous Hall effect (AHE) with hysteresis is observed at T T SG . The data analysis allowed calculation of a correction to the Hall constant R H for T T SG and the AHE constant, R S . R S is around 10 −6 m 3 /C. R S and R H do not change strongly with temperature. The scaling law analysis has proved that the AHE in this system is due to the extrinsic mechanisms dominated by the skew scattering with relatively small contribution of the side jump process. Strong localization occurs in our system at T T SG and causes a presence of a minimum in the resistivity vs. temperature dependence. The magnetoresistance of our samples shows complex behavior at T T SG . The negative magnetoresistance is observed at T T nearly linear positive magnetoresistance is observed at temperatures from 20 K up to T ≈ T SG , where it reaches maximum. Positive linear magnetoresistance is related to the granular nature of our samples while the maximum near T SG is related to the giant spin-splitting of the valence band.
- Published
- 2016
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