Abstract
By the first-principles calculations both for electronic structures and effective exchange constants, we investigate the stability of ferromagnetism of zinc-blende (ZB) type CrAs, and further examine a possibility of ferromagnetism of ZB type MnM (M = Si, Ge and Sn). ZB type CrAs, a half-metallic ferromagnet reported by Akinaga's group [Jpn. J. Appl. Phys. 39 (2000) L1118], is found to have an effective exchange constant (J0 = ∑i≠0 Ji0) larger than 150meV above the lattice constant of GaAs (a = 5.65 Å), showing quite stable ferromagnetism above room temperature as was observed experimentally. We predict that ZB type MnM (M = Ge, Si, Sn) whose valence electron numbers are the same as that of CrAs also exhibit half-metallic ferromagnetism having a positive J0 large enough at a = 5.82 Å, indicating that the Curie temperatures are higher at least than room temperature.
Original language | English |
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Pages (from-to) | 2534-2538 |
Number of pages | 5 |
Journal | journal of the physical society of japan |
Volume | 71 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2002 Oct 1 |
Externally published | Yes |
Keywords
- CrAs
- Curie temperature
- Exchange constants
- First principles calculation
- LMTO
- Magnetic semiconductors
- MnGe
- MnSi
- MnSn
- Zinc-blende structure
ASJC Scopus subject areas
- Physics and Astronomy(all)