Paramagnetic Resonance ofS728Ions in CdSe and CdTe

Abstract

Paramagnetic-resonance measurements for ${\mathrm{Gd}}^{3+}$ in CdSe and CdTe are reported. The resonance parameters for ${\mathrm{Gd}}^{3+}$ are compared with those of the isoelectronic ion ${\mathrm{Eu}}^{2+}$ in the same crystals. The ${b_n}^m$ parameters characterizing the splitting of the ${}_{}{}^8{}_{}{}^{}S_{\frac{7}{2}}^{}{}_{}{}^{}$ ground state are much larger for ${\mathrm{Gd}}^{3+}$ than for ${\mathrm{Eu}}^{2+}$ in both CdSe and CdTe. The $g$ values for ${\mathrm{Gd}}^{3+}$ are significantly lower than those for ${\mathrm{Eu}}^{2+}$. The presently available theories of the splitting of the ${}_{}{}^8{}_{}{}^{}S_{\frac{7}{2}}^{}{}_{}{}^{}$ state are considered in the interpretation of these results.