Tuesday, March 12, 2013

1303.2544 (M. Wang et al.)

High Curie temperatures at low compensation in the ferromagnetic
semiconductor (Ga,Mn)As
   [PDF]

M. Wang, K. W. Edmonds, B. L. Gallagher, A. W. Rushforth, O. Makarovsky, A. Patanè, R. P. Campion, C. T. Foxon, V. Novak, T. Jungwirth
We investigate the relationship between the Curie temperature TC and the carrier density p in the ferromagnetic semiconductor (Ga,Mn)As. Carrier densities are extracted from analysis of the Hall resistance at low temperatures and high magnetic fields. Results are found to be consistent with ion channeling measurements when performed on the same samples. We find that both TC and the electrical conductivity increase monotonically with increasing p, and take their largest values when p is comparable to the concentration of substitutional Mn acceptors. This is inconsistent with models in which the Fermi level is located within a narrow isolated impurity band.
View original: http://arxiv.org/abs/1303.2544

No comments:

Post a Comment