Metal-Insulator Transition and Ferromagnetism in Diluted Magnetic Semiconductors

Abstract

We have investigated the interplay between the metal-insulator transition and ferromagnetism in $({\mathrm{III}}_{1-x},{\mathrm{Mn}}_x)\mathrm{V}$ ferromagnetic semiconductors. Our study is based on a model in which $S=5/2$ Mn local moments are exchange-coupled to band electrons that interact via Coulomb interactions which each other, with ionized Mn acceptors, and with the antisite defects present in these materials. We find quasiparticle participation ratios that are consistent with a metal-insulator transition that occurs in the ferromagnetic state near $x\sim 0.01$. By evaluating the distribution of mean-field exchange coupling strengths at Mn moment sites, we provide evidence in favor of the applicability of small polaron and hole gas models on insulating and metallic sides of the phase transition respectively.

5 pages, 4 figures

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Cited by in corpus (24)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Ferromagnetic Semiconductors: Moving Beyond (Ga,Mn)As
• A disordered RKKY lattice mean field theory for ferromagnetism in diluted magnetic semiconductors
• Disorder effects in diluted magnetic semiconductors
• Magnetic and transport percolation in diluted magnetic semiconductors
• Ellipsometric study of the Electronic Structure of GaMnAs and LT-GaAs
• Probing hole-induced ferromagnetic exchange in magnetic semiconductors by inelastic neutron scattering
• How to make semiconductors ferromagnetic: A first course on spintronics
• Antisite effect on ferromagnetism in (Ga,Mn)As
• Infrared magneto-optical properties of (III,Mn)V ferromagetic semiconductors
• Effective Hamiltonian for Ga_{1-x}Mn_xAs in the Dilute Limit
• Theoretical study of interacting hole gas in p-doped bulk III-V semiconductors
• Carrier induced ferromagnetism in diluted local-moment systems
• Exchange anisotropy, disorder and frustration in diluted, predominantly ferromagnetic, Heisenberg spin systems
• Theory of Weak Localization in Ferromagnetic (Ga,Mn)As
• Magnetotransport properties of strained (Ga0.95, Mn0.05)As epilayers close to the metal-insulator transition: Description using Aronov-Altshuler three-dimensional scaling theory
• The Crossover from Impurity to Valence Band in Diluted Magnetic Semiconductors: The Role of the Coulomb Attraction by Acceptor
• Large-Scale Monte Carlo Study of a Realistic Lattice Model for Ga_(1-x)Mn_xAs
• Disorder, spin-orbit, and interaction effects in dilute ${\mathrm{Ga}}_{1-x}{\mathrm{Mn}}_x\mathrm{As}$
• Infrared conductivity of hole accumulation and depletion layers in (Ga,Mn)As- and (Ga,Be)As-based electric field-effect devices
• Theoretical models of ferromagnetic III-V semiconductors
• Spintronic properties of one-dimensional electron gas in graphene armchair ribbons
• Enhanced ferromagnetism from electron-electron interactions in double exchange type models
• Edge and bulk merons in double quantum dots with spontaneous interlayer phase coherence