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Influence of Local Potential on Exciton Splitting in Highly Diluted Cd_{1-x}Mn_{x}Te

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Kłopotowski L., Herbich M., Mac W., Stachow-Wójcik A., Twardowski A.
Acta Physica Polonica A
|
1997
|
vol. 92
|
issue 4
837-840
EN
We investigated magnetoreflectance and magnetization of highly diluted bulk Cd_{1-x}Mn_{x}Te crystals 0.2% ≤ x ≤ 10%. The exchange constant in terms of mean field approximation and virtual crystal approximation (the ratio of the heavy hole exciton splitting to mean spin per unit cell) was evaluated and found x-dependent. This deviation from the mean field approximation and virtual crystal approximation prediction is caused by the local potential introduced by Mn ions. We discuss the problem within a Wigner-Seitz approach and within a model of magnetic and chemical disorder based on the alloy theory.
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