Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-06-20
Physics
Condensed Matter
Disordered Systems and Neural Networks
Proceedings of the International Conference MSM05, Agadir Maroc September 2005'', to appear in Physica Status Solidi
Scientific paper
10.1002/pssa.200567046
Using a recently developed semi-analytical method (Self-Consistent Local RPA or SC-LRPA) we study the stability of the ferromagnetic phase in diluted magnetic systems where the exchange coupling between magnetic impurities are of RKKY form. A short discussion of the relevance of these calculations with respect to the ferromagnetism observed in diluted ferromagnetic materials is provided. Then, within a two step approach, we study ferromagnetism in $Zn_{1-x}Cr_{x}Te$. In the first step of our study, we calculate the magnetic couplings between Mn impurities within the LDA. In the second step, we diagonalize the resulting effective Heisenberg Hamiltonian using the SC-LRPA. We also compare, when available, our calculations with Monte Carlo simulations and experimental measurements.
Bouzerar Richard
Ziman Timothy
~Bouzerar Georges
~Kudrnovský Josef
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