Abstract
An isotropic optically detected magnetic-resonance (ODMR) peak at g=1.997 is found in as-grown Sn-doped InP while monitoring the magnetic circular dichroism (MCD) of an absorption band at \ensuremath{\sim}900 nm. No fine or hyperfine structure is resolved. Optically detected electron-nuclear double resonance (ODENDOR) reveals spectra arising from a central Mn core (I=5/2, with isotropic hyperfine interaction A/h=-166.0\ifmmode\pm\else\textpm\fi{}0.3 MHz) and neighboring P and In shells. The pattern and spacings of these lines reveal that the defect is isolated ${\mathrm{Mn}}^{\mathrm{\ensuremath{-}}}$(${\mathit{d}}^{5}$), substituting for In, with S=5/2. A surprise observation is that the MCD, ODMR, and ODENDOR disappear abruptly when the material is converted to high-resistivity n type by electron irradiation.
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