Mn-rich clusters in GaN: Hexagonal or cubic symmetry?

Martínez-Criado, G.; Somogyi, A.; Ramos, S.; Campo, J.; Tucoulou, R.; Salome, M.; Susini, J.; Hermann, M.; Eickhoff, M.; Stutzmann, M.
March 2005
Applied Physics Letters;3/28/2005, Vol. 86 Issue 13, p131927
Academic Journal
In this study, we report the application of synchrotron radiation microprobe to the analysis of Mn-rich clusters in GaN. From the Mn and Ga fluorescence line intensity ratio, an average Mn concentration of 11% was deduced. A combination of fluorescence mapping with spectroscopic techniques enabled us to examine not only the cluster elemental nature but also their crystallographic orientation on the submicron scale. The strong polarization-dependent x-ray absorption near-edge structure features showed the preservation of the hexagonal symmetry in both cluster-free and Mn-rich regions. However, from the x-ray absorption data taken inside the clusters, a preferential disorder was observed in the direction parallel to the crystal growth rather than perpendicular to it.


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