Observation of Dipolar-Induced Spin Dephasing in Ionic Solids Using Coherent Optical-Microwave Spectroscopy

Abstract

The observation of spin dephasing in an ensemble of dipolar coupled $A$ and $B$ spins is reported. In CaO crystals, the $A$-spin species are photoexcited $S=1$, ${{F}_{2}}^{2+}$ centers and the group of $B$ spins consists of $S=\frac{1}{2}$, ${F}^{+}$ centers. Measurements were made at different temperatures and magnetic field strengths with use of coherent optical-microwave spectroscopy. For the first time, the results show that the $A$-spin dephasing is influenced by exchange narrowing in the $B$-spin ensemble.