Electron Paramagnetic Resonance ofFe3+in the Strong Axial Field of PbTiO3Host

Abstract

An electron paramagnetic resonance investigation has been made of single crystals of tetragonal PbTi${\mathrm{O}}_3$. A spectrum attributed to ${\mathrm{Fe}}^{3+}$ was found which can be described by the spin Hamiltonain: $\mathcal{H}=g_{\mathrm{II}}\beta H_z{S}_z+g_{\perp }\beta (H_x{S}_x+H_y{S}_y)$ with $S=\frac{1}{2}$, $g_{\mathrm{II}}=2.009\mathrm{}\pm 0.005$ and $g_{\perp }=5.97\mathrm{}\pm 0.02$ at room temperature. These values are explained in terms of a strong tetragonal component of the crystalline field.