PL EN


Preferences help
enabled [disable] Abstract
Number of results
1995 | 88 | 4 | 655-662
Article title

Beyond Virtual Crystal and Molecular Field Approximations in Diluted Magnetic Semiconductors

Authors
Content
Title variants
Languages of publication
EN
Abstracts
EN
The framework of the virtual crystal approximation and the molecular field approximation has been widely used in the description of the extended states affected by the presence of the p-d exchange interaction in diluted magnetic semiconductors. We review shortly the known examples of diluted magnetic semiconductors systems which are described beyond these approx­imations. The interesting case constitutes the nearly binding impurity po­tential in Cd_{1-x}Μn_{x}S. The lattice approaches developed earlier allowed to prove in this case the breakdown of the virtual crystal approximation for low concentrations of magnetic ions and to explain the apparent concentra­tion dependence of the exchange integral. We take explicitly into account the substitutional disorder neglected in the lattice theories and we rederive these results within the dilute and the average t-matrix alloy approach. We generalize systematically this theory to include also the magnetic disorder of the dilute spin subsystem appearing at finite temperatures. When the off-diagonal exchange scattering terms are taken into account in our calcula­tions, we get a good agreement with the experimental data on the asymmetric field dependent spin splitting and the zero-field concentration dependence of the energy gap.
Keywords
EN
Publisher

Year
Volume
88
Issue
4
Pages
655-662
Physical description
Dates
published
1995-10
Contributors
author
  • Institute of Theoretical Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv88z410kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.