Abstract
Using electronic structure methods and statistical methods, we have studied theoretically the volume dependence of the exchange interactions and Curie temperatures in the diluted magnetic semiconductors. In both Mn-doped GaAs and Mn-doped InAs, the calculated Curie temperatures from numerical exact Monte Carlo simulations are more or less constant for a large volume interval. We have compared the exchange mechanisms in Mn-doped GaAs using both the local density approximation (LDA) and the method. It is demonstrated that the magnetic properties are understood within Zener’s exchange model for the , while in LDA they reflect a mixture between double and exchange mechanisms.
- Received 18 September 2007
DOI:https://doi.org/10.1103/PhysRevB.77.014418
©2008 American Physical Society