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 language | English |
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Article number | 241202 |
Pages (from-to) | 2412021-2412024 |
Number of pages | 4 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 65 |
Issue number | 24 |
DOIs | |
State | Published - Jun 15 2002 |
Externally published | Yes |