Abstract
Strongly anisotropic photoinduced electron paramagnetic resonance spectrum was found in the KTa1-x Nb x O3 crystals with x = 0.012 at T < 10 K, which is described well within the model of the center with S = 1, g ∥ = 0.82 ± 0.04, g ⊥ = 0.52 ± 0.04, and D = 0.44 ± 0.03 cm−1. Analysis shows that this spectrum originates from the Nb4+−O− polaronic exciton in the triplet state.
Acknowledgements
This work has been supported in part by the Grants 1M06002 of the MSMT CR, AV ČR AV0Z10100522, SC 02.740.11.5162 and P-RAS “Quantum Physics of Condensed Matter”.