Electron-spin-resonance study of manganese-doped spinel

Abstract

An electron-spin-resonance study of manganese-doped synthetic spinel samples (Mg${\mathrm{Al}}_{2}$${\mathrm{O}}_{4}$) produced spectra with six sharp main lines corresponding to the hyperfine components of the ${M}_{s}=\frac{1}{2}\ensuremath{\leftrightarrow}{M}_{s}=\ensuremath{-}\frac{1}{2}$ transitions with the coupling constant $A=83$ G, ten sharp forbidden transitions, and a broad background arising from the effect of the $D$ tensor on the other four ${M}_{s}\ensuremath{\leftrightarrow}M_{}^{\ensuremath{'}}{}_{s}{}^{}$ transitions. The measured value of ${D}_{\mathrm{expt}}$ equal to 64 G was explained in terms of the Goodenough model using the Orbach et al. method.