Study of magnetic polaron effect in Cd1-XDyXTe diluted magnetic semiconductors

The temperature dependences of photoluminescence and exciton reflection spectra of the novel Cd1-XDyXTe diluted magnetic semiconductors (DMSs) were measured. The obtained experimental results reveal the magnetic polaron (MP) effect. This effect is observed for the localized, acceptor-bound excitons,...

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Published in:Physica. B, Condensed matter Condensed matter, 2020-09, Vol.593, p.412295, Article 412295
Main Authors: Bukivskij, P.M., Gnatenko, Yu.P., Bukivskii, A.P.
Format: Article
Language:English
Subjects:
Defects
Diluted magnetic semiconductors
Dilution
Exchanging
Excitation spectra
Excitons
Magnetic fields
Magnetic polarons
Magnetic semiconductors
Photoluminescence
Polarons
Rare earth elements
Semiconductors
Spintronics
Thermodynamics
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Summary:The temperature dependences of photoluminescence and exciton reflection spectra of the novel Cd1-XDyXTe diluted magnetic semiconductors (DMSs) were measured. The obtained experimental results reveal the magnetic polaron (MP) effect. This effect is observed for the localized, acceptor-bound excitons, and for the acceptor holes associated with Na or Li residual impurities. Simulation of the experimental data by a theoretical model allowed us to determine the characteristic energy of the MP as well as magnetic contributions associated with the average exchange field and the thermodynamic fluctuations of local magnetization for the acceptor-bound excitons and the acceptor holes. Furthermore, it was found that the values of the exchange interaction for the holes in Cd1-XDyXTe and Cd1-XMnXTe DMSs are close. These findings indicate that DMSs based on rare earth elements can be considered as novel promising materials for spintronics. •Photoluminescence (PL) and exciton reflection spectra of Cd1-XDyXTe were studied.•Localized and acceptor-bound excitons were found in PL spectra.•It was revealed that broad PL bands are caused by (e-A) optical transitions.•Magnetic polaron effect for the excitons and the acceptor holes was observed.•Different magnetic contributions to magnetic polaron energy were determined.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2020.412295