Impurity bands and the character of the electronic states in ferromagnetic GaMnAs layers

Details Impurity bands and the character of the electronic states in ferromagnetic GaMnAs layers Impurity bands and the character of the electronic states in ferromagnetic GaMnAs layers

2008-06-20

arxiv.org/abs/0806.3423v2

Appl. Phys. Lett. 93, 112110 (2008)

Physics

Condensed Matter

Materials Science

4 figures. Text changed and references added. Journal-ref added

Scientific paper

10.1063/1.2981569

The interplay between disorder and spin polarization in a GaMnAs thin layer results into spin-polarized impurity hole bands. A figure of merit is defined to label the hole state as being extended or localized. The calculation leads to a phase diagram determining the metallic or non-metallic character of the sample. It is shown that samples with the highest figures of merit have a ratio between the extended hole density and the Mn concentration near 0.2, in agreement with the ratio of 0.1-0.25 known to occur among samples produced with the highest Curie temperatures. Both the non-metal-to-metal and the metal-to-non-metal transitions experimentally observed in the ferromagnetic regime are obtained, as the Mn concentration increases. An explanation is given for the occurrence of a maximal Curie temperature in ferromagnetic GaMnAs samples.

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