Infrared pump-probe measurement for the OD stretching mode in KTaO has been performed. We observed the induced absorption signal corresponding to the 1-2 transition for the first time in oxide crystals in addition to the bleaching signal of the 0-1 transition. Both signals show long decay time of ∼200 ps, and the potential anharmonicity is found to be 3.6%. We also investigated temperature dependence of OH/OD absorption spectra to explore how a proton/deuteron interacts with the surrounding lattice vibrations, and identify the phonon mode which causes the potential fluctuations as a O-Ta-O bending motion. On the basis of the results obtained, we calculate the potential energy surface on which a proton/deuteron moves and discuss the proton conduction mechanism in solid oxides.
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