Extended x-ray absorption fine structure in Ga1−xMnxN/SiC films with high Mn content
2011
In this study, the local atomic structure of highly homogeneous Ga1−xMnxN alloy films (0.03 < x < 0.09) is analyzed by means of Mn and Ga K-edge extended x-ray absorption fine structure measurements. From the curve fitting, the structural parameters corresponding to the first two atomic shells surrounding both Ga and Mn atoms are reported. In the Ga1−xMnxN films, grown by molecular beam epitaxy, the Mn atoms are in tetrahedral configuration, independent of the Mn concentration; that is, they are in a substitutional site, MnGa, in the wurtzite structure. A small increase in the interatomic distances has been found with increasing Mn content. The Debye-Waller factor does not show a significant trend as Mn content increases, which suggests the presence of short-range disorder in the GaN lattice. Ab initio calculations of the structural parameter for two different Mn concentrations are consistent with the experimental results.
Keywords:
- Nuclear magnetic resonance
- Atomic physics
- X-ray absorption fine structure
- Molecular beam epitaxy
- Physics
- Atom
- Electron shell
- Extended X-ray absorption fine structure
- Electronic structure
- Wurtzite crystal structure
- X-ray absorption spectroscopy
- Inorganic chemistry
- Condensed matter physics
- Analytical chemistry
- Ab initio quantum chemistry methods
- Molecular physics
- Alloy
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