Abstract
Using the exact diagonalization technique for a finite-size cluster, we have studied the effect of a non-magnetic atom on the magnetism of the double-exchange ferromagnet constituted of the Hubbard model and localized spin system. The non-magnetic atom raises the critical correlation energy Uc for the full spin polarization, but spreads a partial spin polarization region below Uc. This is caused by the effect that a double occupation of electrons, realized at the non-magnetic atom, reduces the total spin but stabilizes the ferromagnetic phase with the help of kinetic-energy gain of the conduction electrons. Based on the present results, we discuss the ferromagnetism of some Mn or Fe alloys containing non-magnetic elements such as B, C, N, Al, Si, etc.
Original language | English |
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Pages (from-to) | 173-178 |
Number of pages | 6 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 173 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 1997 Sep 1 |
Externally published | Yes |
Keywords
- Double-exchange interaction
- Exact diagonalization
- Ferromagnetism
- Iron nitrides
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics