Physics – Condensed Matter – Materials Science
Scientific paper
2012-03-08
Physics
Condensed Matter
Materials Science
5 figures, supplementary material included
Scientific paper
10.1038/NMAT3250
The ferromagnetic semiconductor (Ga,Mn)As has emerged as the most studied material for prototype applications in semiconductor spintronics. Because ferromagnetism in (Ga,Mn)As is hole-mediated, the nature of the hole states has direct and crucial bearing on its Curie temperature TC. It is vigorously debated, however, whether holes in (Ga,Mn)As reside in the valence band or in an impurity band. In this paper we combine results of channeling experiments, which measure the concentrations both of Mn ions and of holes relevant to the ferromagnetic order, with magnetization, transport, and magneto-optical data to address this issue. Taken together, these measurements provide strong evidence that it is the location of the Fermi level within the impurity band that determines TC through determining the degree of hole localization. This finding differs drastically from the often accepted view that TC is controlled by valence band holes, thus opening new avenues for achieving higher values of TC.
Berciu Mona
Dobrowolska Malgorzata
Furdyna Jacek K.
Liu Xiandong
Tivakornsasithorn K.
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