Paramagnetic Resonance of Erbium in a Single Crystal of Magnesium

Abstract

The anisotropic electron-paramagnetic-resonance spectrum of an erbium-doped single crystal of magnesium metal is characteristic of a uniaxially distorted ${\Gamma }_7$ doublet of the free-ion ${}_{}{}^4{}_{}{}^{}I_{\frac{15}{2}}^{}{}_{}{}^{}$ multiplet. The observed linewidth anisotropy is consistent with an isotropic conduction-electron-localized-electron exchange interaction.