Abstract
We present Fourier transform infrared transmission measurements on Fe-doped GaN. A set of freestanding high-quality GaN:Fe samples with varying Fe concentrations shows a rich absorption structure around $390\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ which is unambiguously assigned to the internal $^{5}E\ensuremath{\rightarrow}^{5}T_{2}$ transition of the ${\mathrm{Fe}}^{2+}$ center. Up to now, the $^{5}T_{2}$ state was believed to be degenerate with the conduction band. By means of temperature- and polarization-dependent measurements the observed lines can be assigned to single transitions between $^{5}E$ and $^{5}T_{2}$ sublevels. As a result a quantitative term scheme of the ${\mathrm{Fe}}^{2+}$ center, under the influence of the ${C}_{3V}$-symmetric crystal field, is established. Only a weak Jahn-Teller interaction seems to effect the Fe center.
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