Mn induced modifications of Ga 3d photoemission from (Ga, Mn)As:   evidence for long range effects
  Using synchrotron based photoemission, we have investigated the Mn-induced changes in Ga 3d core level spectra from as-grown ${\rm Ga}_{1-x}{\rm Mn}_{x}{\rm As}$. Although Mn is located in Ga substitutional sites, and does therefore not have any Ga nearest neighbours, the impact of Mn on the Ga core level spectra is pronounced even at Mn concentrations in the range of 0.5%. The analysis shows that each Mn atom affects a volume corresponding to a sphere with around 1.4 nm diameter. 
J. Kanski, I. Ulfat, L. Ilver, M. Leandersson, J. Sadowski, K.   Karlsson and P. Pal
cond-mat.mtrl-sci