Electronic structure and magneto-optical properties of Co2MnX alloys where X = Ge, Sn and Pb: a First-principles investigation in the LDA plus U approach
- Authors
- Quang Van Tran; Lee, Jae Il; Kim, Miyoung
- Issue Date
- Jun-2013
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- First-principles; Electronic structure; Magneto-optics; Surface states
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.62, no.12, pp 2184 - 2187
- Pages
- 4
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 62
- Number
- 12
- Start Page
- 2184
- End Page
- 2187
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/11257
- DOI
- 10.3938/jkps.62.2184
- ISSN
- 0374-4884
1976-8524
- Abstract
- We report our ab - initio calculational results for the electronic structures and the magnetooptical (MO) properties of the ferromagnetic Co2MnX full Heusler alloys where X = Ge, Sn and Pb. Employing the +U corrections for the 3d bands of transition-metal atoms in addition to the conventional local density approximation (LDA), we investigate the correlation effect on the MO spectra in a polar geometry and the detailed electronic structures. Results show that the correlation effect results in a blue-shift of the peak positions and a large enhancement of the MO spectra up to double in magnitude compared to the LDA results. We find that our results can be attributed to the increased t (2g) - e (g) splitting of the spin-minority d-bands of both Co and Mn atoms, which indicates a suppression of the diagonal elements of the optical conductivity in the energy region of 1-2 eV where the interband transitions are forbidden.
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