Electron Paramagnetic Resonance ofMn2+in KTaO3

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Abstract
The electron paramagnetic resonance of Mn2+ in KTaO3 was measured over a temperature range 4-110 K. At 77 K, the spin-Hamiltonian constants are g∥=2.000±0.001, g⊥=2.000±0.001, D=+0.147±0.003 cm−1, A∥=−(86.5±0.5)×10−4 cm−1, A⊥=−(84±1.5)×10−4 cm−1. The results indicate that the Mn2+ is substitutional at a Ta5+ site with an adjacent oxygen vacancy. The temperature dependence of D is correlated with the soft-mode frequency of the host. The quadrupole splitting Q′=+(0.8±0.1)×10−4 cm−1 was determined from the forbidden hyperfine transitions.