Electronic structure and unusual magnetic properties of diluted magnetic semiconductors Pb1-x-ySnxScyTe
Skipetrov, E. P. 1Bogdanov, E., V 1Kovalev, B. B. 1Skipetrova, L. A. 1Knotko, A., V 1Emelyanov, A., V 2Taldenkov, A. N. 2Slynko, V. E.3
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作者信息
1. Lomonosov Moscow State Univ
2. Kurchatov Inst
3. Natl Acad Sci Ukraine
折叠
Abstract
We synthesize a single-crystal Pb1-x-ySnxScyTe ingot and investigate the magnetic properties (2.0 <= T <= 300 K, B <= 3 T) of alloys cut from it (x = 0.045-0.175, y <_ 0.04). At low temperatures, all samples exhibit paramagnetic contribution to the magnetization, which contradicts the generally accepted model of doping-induced rearrangement of the electronic structure of alloys and is most likely due to the paramagnetism of electrically neutral Sc2+ ions or their clusters. In p-type samples, a high-temperature ferromagnetic ordering with a Curie temperature as high as T-C = 145-150 K is found, presumably due to the RKKY hole-mediated interaction of Sc2+ ions. We obtain dependences of the concentration of paramagnetic ions, of the paramagnetic Curie-Weiss temperature Theta and of the Curie temperature T-C on the concentrations of scandium and tin. At temperatures T < 100 K, the spin-glass-like behavior of magnetization and ferromagnetic hysteresis loops in the field dependences of magnetization are detected, indicating the formation of a mixed ferromagnetic-spin glass phase. (C) 2021 Elsevier B.V. All rights reserved.
Key words
Semiconductors/Crystal growthElectronic band structure/Impurities in semiconductors/Magnetic measurements/Scanning electron microscopy/CARRIER-CONCENTRATION/EXCHANGE INTERACTION/FERROMAGNETISM/SN/TE/TRANSPORT/IRON/BAND/PB/PECULIARITIES
NSTL
Elsevier