Global versus local ferromagnetism in a model for diluted magnetic semiconductors studied with Monte Carlo techniques

Matthias Mayr, Gonzalo Alvarez, Elbio Dagotto

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72 Scopus citations

Abstract

A model recently introduced for diluted magnetic semiconductors by Berciu and Bhatt [Phys. Rev. Lett. 87, 107203 (2001)] is studied with a Monte Carlo technique, and the results are compared with Hartree-Fock calculations. For doping rates close to the experimentally observed metal-insulator transition, a picture dominated by ferromagnetic droplets formed below a T* scale emerges. The moments of these droplets align as the temperature is lowered below a critical value Tc<T*. Our Monte Carlo investigations provide critical temperatures considerably smaller than Hartree-Fock predictions. Disorder does not seem to enhance ferromagnetism substantially. The inhomogeneous droplet state should be strongly susceptible to changes in doping and external fields.

Original languageEnglish
Article number241202
Pages (from-to)2412021-2412024
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number24
DOIs
StatePublished - Jun 15 2002
Externally publishedYes

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