Disorder effects in diluted ferromagnetic semiconductors

Abstract

Carrier induced ferromagnetism in diluted III-V semi-conductor is analyzed within a two step approach. First, within a single site CPA formalism, we calculate the element resolved averaged Green's function of the itinerant carrier. Then using a generalized RKKY formula we evaluate the Mn-Mn long-range exchange integrals and the Curie temperature as a function of the exchange parameter, magnetic impurity concentration and carrier density. The effect of the disorder (impurity scattering) appears to play a crucial role. The standard RKKY calculation (no scattering processes), strongly underestimate the Curie temperature and is inappropriate to describe magnetism in diluted magnetic semi-conductors. It is also shown that an antiferromagnetic exchange favors higher Curie temperature.

tex file + 4 .eps figures are included. submited to PRL

References in corpus (4)

• Transition temperature of ferromagnetic semiconductors: a dynamical mean field study
• Monte Carlo Study of Ferromagnetism in (III,Mn)V Semiconductors
• Impurity-Semiconductor Band Hybridization Effects on the Critical Temperature of Diluted Magnetic Semiconductors
• Carrier induced ferromagnetism in diluted magnetic semi-conductors

Cited by in corpus (12)

• Calculating the Curie Temperature reliably in diluted III-V ferromagnetic semiconductors
• Why RKKY exchange integrals are inappropriate to describe ferromagnetism in diluted magnetic semiconductors
• Influence of non-local exchange on RKKY interactions in III-V diluted magnetic semiconductors
• Non-perturbative $J_{pd}$ model and ferromagnetism in dilute magnets
• Positional Disorder, Spin-Orbit Coupling and Frustration in GaMnAs
• Carrier induced ferromagnetism in diluted local-moment systems
• Carrier induced ferromagnetism in concentrated and diluted local-moment systems
• Role of Correlation and Exchange for Quasi-particle Spectra of Magnetic and Diluted Magnetic Semiconductors
• Effects of dilution and disorder on magnetism in diluted spin systems
• Ground-state properties and molecular theory of Curie temperature in the coherent potential approximation of diluted magnetic semiconductors
• Curie temperatures of the concentrated and diluted Kondo-lattice model as a possible candidate to describe magnetic semiconductors and metals
• Comparison between ab-initio and phenomenological modeling of the exchange couplings in diluted magnetic semiconductors: the case of $Z{n}_{1-x}C{r}_{x}Te$