Paramagnetic Resonance of the Cobalt Ion in Rutile Single Crystal

Abstract

The electron paramagnetic resonance of ${\mathrm{Co}}^{2+}$ in single-crystal rutile (Ti${\mathrm{O}}_2$) has been investigated at 3-cm wavelength and 4.2°K. The angular dependence of the resonance pattern indicates that the ${\mathrm{Co}}^{2+}$ ion enters substantially for the ${\mathrm{Ti}}^{4+}$ ion in the lattice. Strongly anisotropic values of the splitting factor $g$ and hfs constant $A$ are obtained, which may be understood in terms of a fairly large charge transfer to the surrounding ions.