We have investigated the effect of doping by Te on the anomalous Hall effect in Ga1-xMnxAs (x=0.085). For this relatively high value of x the temperature dependence of resistivity shows an insulating behavior. It is well known that in Ga1-xMnxAs the Mn ions naturally act as acceptors. Additional doping by Te donors decreases the Curie temperature and increases the anomalous Hall resistivity. With increasing Te concentration the long-range ferromagnetic order in Ga1-xMn xAs eventually disappears, and the paramagnetic-to-spin glass transition is observed instead. The critical concentration of holes required for establishing ferromagnetic order in the Ga0.915Mn0.085As has been estimated by using the magnetic polaron percolation theory proposed by Kaminski and Das Sarma.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2004 Nov|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics