composition x= 0.03–0.09 have been prepared by molecular beam epitaxy. It is found that
the relation between maximum Curie temperature TC and Mn content x can be expressed
experimentally by TC= 800x up to about TC= 50K within the limit of this study. The hole
concentration sufficient for TC= 50K is found to be several times lower than the value shown
in the existing theory (Science 287 (2000) 1049). Formation of structural pairs of Mn atoms …