Zeeman Effect ofCr3+Fluorescence in SrTiO3

Abstract

The purely electronic transition of the 8000-Å fluorescence of pure and chromium-doped SrTi${\mathrm{O}}_3$ has been studied using applied magnetic fields. The transverse Zeeman spectrum shows that the fluorescence is the magnetic dipole transition from the ${}_{}{}^2{}_{}{}^{}E_g^{}{}_{}{}^{}$ to the ${}_{}{}^4{}_{}{}^{}A_{2g}^{}{}_{}{}^{}$ state of the ${\mathrm{Cr}}^{3+}$ ion. The ${}_{}{}^2{}_{}{}^{}E_g^{}{}_{}{}^{}$ state is split by the tetragonal crystal field below 110°K. Relative intensities of the components with an applied magnetic field along a [110] direction show that the $v$ component lies highest in energy, indicating that the distortion is tensive.