Abstract
Spin coherence decay in the photo-excited 3B1 state of exchange-coupled F+ -center pairs in CaO is studied utilizing techniques for the optical detection of spin echoes and spin locking. The homogeneous dephasing time is shown to decrease rapidly with increasing (low) magnetic field strengths. The phenomenon arises because H induces a magnetic moment within the triplet spin system and as a result dipolar spin-spin interactions become increasingly important in the dephasing processes. As the temperature is raised from 1.5 K up to 10 K, the spin-echo decay shapes are changed from exponential to Gaussian whereas the dephasing time, TM, is increased from 150 µs up to 300 µs. The results are related to existing spectral diffusion theories.
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