Single-Band Model for Diluted Magnetic Semiconductors: Dynamical and Transport Properties and Relevance of Clustered States

Abstract

Dynamical and transport properties of a simple single-band spin-fermion lattice model for (III,Mn)V diluted magnetic semiconductors (DMS) is here discussed using Monte Carlo simulations. This effort is a continuation of previous work (G. Alvarez, Phys. Rev. Lett. 89, 277202 (2002)) where the static properties of the model were studied. The present results support the view that the relevant regime of J/t (standard notation) is that of intermediate coupling, where carriers are only partially trapped near Mn spins, and locally ordered regions (clusters) are present above the Curie temperature T_C. This conclusion is based on the calculation of the resistivity vs. temperature, that shows a soft metal to insulator transition near T_C, as well on the analysis of the density-of-states and optical conductivity. In addition, in the clustered regime a large magnetoresistance is observed in simulations. Formal analogies between DMS and manganites are also discussed.

Revtex4, 20 figures. References updated, minor changes to figures and text

References in corpus (20)

• Polaron percolation in diluted magnetic semiconductors
• Ferromagnetic semiconductors
• Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities
• Effects of annealing time on defect-controlled ferromagnetism in Ga1-xMnxAs
• Highly enhanced Curie temperatures in low temperature annealed (Ga,Mn)As epilayers
• Unconventional carrier-mediated ferromagnetism above room temperature in ion-implanted (Ga, Mn)P:C
• Transition temperature of ferromagnetic semiconductors: a dynamical mean field study
• Curie Temperature Trends in (III,Mn)V Ferromagnetic Semiconductors
• Phase Diagram of a Model for Diluted Magnetic Semiconductors Beyond Mean-Field Approximations
• Spin-polarized Tunneling in Hybrid Metal-Semiconductor Magnetic Tunnel Junctions
• Correlated defects, metal-insulator transition, and magnetic order in ferromagnetic semiconductors
• Global versus Local Ferromagnetism in a Model for Diluted Magnetic Semiconductors Studied with Monte Carlo Techniques
• Monte Carlo simulations of an impurity band model for III-V diluted magnetic semiconductors
• Electronic structure of In${}_{1-x}$Mn${}_x$As studied by photoemission spectroscopy: Comparison with Ga${}_{1-x}$Mn${}_x$As
• Infrared conductivity of metallic (III,Mn)V ferromagnets
• Photoemission studies of Ga${}_{1-x}$Mn${}_x$As: Mn-concentration dependent properties
• Impurity-Semiconductor Band Hybridization Effects on the Critical Temperature of Diluted Magnetic Semiconductors
• Optical Conductivity of Ferromagnetic Semiconductors
• Non-Drude Optical Conductivity of (III,Mn)V Ferromagnetic Semiconductors
• Magnetic Interactions and Transport in (Ga,Cr)As

Cited by in corpus (28)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor
• Disorder effects in diluted magnetic semiconductors
• Magnetic and transport percolation in diluted magnetic semiconductors
• Optical Properties of III-Mn-V Ferromagnetic Semiconductors
• Ellipsometric study of the Electronic Structure of GaMnAs and LT-GaAs
• Magneto-transport and magneto-optical properties of ferromagnetic (III,Mn)V semicondcutors: a review
• Weak localization in GaMnAs: evidence of impurity band transport
• Insulator to Metal Transition Induced by Disorder in a Model for Manganites
• Origin of transition metal clustering tendencies in GaAs based dilute magnetic semiconductors
• The Truncated Polynomial Expansion Monte Carlo Method for Fermion Systems Coupled to Classical Fields: A Model Independent Implementation
• Ferromagnetism in a dilute magnetic semiconductor -- Generalized RKKY interaction and spin-wave excitations
• Optical properties of metallic (III,Mn)V ferromagnetic semiconductors in the infrared to visible range
• Critical Temperatures of a Two-Band Model for Diluted Magnetic Semiconductors
• Carrier induced ferromagnetism in diluted local-moment systems
• Exchange anisotropy, disorder and frustration in diluted, predominantly ferromagnetic, Heisenberg spin systems
• Ion-beam modification of the magnetic properties of GaMnAs epilayers
• Structural and transport properties of GaAs/delta<Mn>/GaAs/InxGa1-xAs/GaAs quantum wells
• Clustered States as a New Paradigm of Condensed Matter Physics
• Spin dynamics in the diluted ferromagnetic Kondo lattice model
• Unconventional ferromagnetism and transport properties of (In,Mn)Sb dilute magnetic semiconductor
• Magnetic susceptibility of diluted magnetic semiconductors at low carrier densities
• Theory of optical conductivity for dilute GaMnAs
• Magnetic susceptibilities of diluted magnetic semiconductors and anomalous Hall-voltage noise
• Calculation of Dynamical and Many-Body Observables with the Polynomial Expansion Method for Spin-Fermion Models
• The ground state phase diagram of the diluted ferromagnetic Kondo-lattice model
• On the reliability of recent Monte Carlo studies of dilute systems of localized spins interacting with itinerant carriers
• Enhanced ferromagnetism from electron-electron interactions in double exchange type models