Issue |
EPL
Volume 83, Number 6, September 2008
|
|
---|---|---|
Article Number | 69001 | |
Number of page(s) | 5 | |
Section | Geophysics, Astronomy and Astrophysics | |
DOI | https://doi.org/10.1209/0295-5075/83/69001 | |
Published online | 05 September 2008 |
Electronic structure and magnetism of EuX (X = O, S, Se and Te): A first-principles investigation
1
Department of Physics, Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University, Xiasha College Park - Hangzhou 310018, China
2
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences - Shanghai 200050, China
3
Department of electronics, Jiangxi University of Finance and Economy - Nanchang 330013, China
Corresponding author: siqishi@yahoo.com
Received:
1
May
2008
Accepted:
24
July
2008
Electronic structures and magnetic properties of EuX (X = O,
S, Se and Te) are investigated by the plane-wave pseudopotential method with
explicit account for Coulomb repulsion within the shell, and compared with
other theoretical and experimental results. All the EuX compounds are magnetic semiconductors with noticeable indirect
-X gap. Ferromagnetic ordering is observed for EuO and EuS while antiferromagnetic
ordering along [111] is the ground state for EuSe and EuTe. These results
are consistent with the experiments, although previous calculations indicated that the ground state of EuS is antiferromagnetic. The exchange
parameters are calculated, and are in fair agreement with experimental
results.
PACS: 91.60.Pn – Magnetic and electrical properties / 31.15.aq – Strongly correlated electron systems: generalized tight-binding method / 77.84.Bw – Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
© EPLA, 2008
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