Bibliographic Details
| Title: |
Exchange Interaction and $T_c$ in Alkaline-earth-metal-oxide-based DMS without Magnetic Impurities: First Principle Pseudo-SIC and Monte Carlo Calculation |
| Authors: |
Dinh, Van An, Toyoda, Masayuki, Sato, Kazunori, Katayama-Yoshida, Hiroshi |
| Source: |
J. Phys. Soc. Jpn. 75 (2006) 093705 |
| Publication Year: |
2008 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Materials Science, Condensed Matter - Disordered Systems and Neural Networks |
| More Details: |
The prospects of half-metallic ferromagnetism being induced by the incorporation of C atoms into alkaline-earth-metal-oxides are investigated by the first principle calculation. The origin of the ferromagnetism is discussed through the calculation of the electronic structure and exchange coupling constant by using the pseudo-potential-like self-interaction-corrected local spin density method. The Curie temperature ($T_c$) is also predicted by employing the Monte Carlo simulation. It is shown that by taking the electron self-interaction into account, the half-metallic ferromagnetism induced by C in the host materials is more stabilized in comparison with the standard LDA case, and the C's $2p$ electron states in the bandgap become more localized resulting in the predominance of the short-ranged exchange interaction. While the ferromagnetism in MgO$_{1-x}$C$_x$ is stabilized due to the exchange interaction of the $1st$-nearest neighbor pairs and might be suppressed by the anti-ferromagnetic super-exchange interaction at higher $x$, the ferromagnetism in CaO$_{1-x}$C$_x$, SrO$_{1-x}$C$_x$, and BaO$_{1-x}$C$_x$ is stabilized by both the $1st$- and $2nd$-nearest neighbor pairs, and $T_c$ monotonously increases with the C concentration.
Comment: 5 pages, 5 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1143/JPSJ.75.093705 |
| Access URL: |
http://arxiv.org/abs/0801.2249 |
| Accession Number: |
edsarx.0801.2249 |
| Database: |
arXiv |
