Effect of 3d-transition metal atoms distribution on exchange interaction and optical spectra in the diluted magnetic semiconductors of III–V and IV groups
| Autor: | K. Motizuki, Yu. A. Uspenskii, A. Titov, E. T. Kulatov, Joel Cibert, Hitoshi Ohta, H. Nakayama, Henri Mariette |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Condensed matter physics Silicon Exchange interaction Analytical chemistry chemistry.chemical_element Germanium Magnetic semiconductor Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry Ferromagnetism Antiferromagnetism Curie temperature Absorption (chemistry) |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 300:140-143 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2005.10.051 |
| Popis: | We calculated the total energy of ferromagnetic (FM) and antiferromagnetic (AFM) GaN:Mn, GaAs:Mn, Ge:Mn and Si:Mn with various distribution of Mn atoms. It is found that the formation of Mn–N–Mn–N chain-like fragments largely lowers the total energy of GaN:Mn. Exchange interaction in the chains has AFM character, so this mechanism can result in a significant decrease of the Curie temperature of GaN:Mn. Our optical calculations show that the formation of such chain-like fragments introduces features in intragap absorption and can be observed in optical measurements. In GaAs:Mn, Ge:Mn and Si:Mn this mechanism is not efficient and the formation of the chains of Mn atoms has no significant effect on Curie temperature. |
| Databáze: | OpenAIRE |
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