Proton tunneling: A decay channel of the O-H stretch mode in KTaO3

E. J. Spahr, L. Wen, M. Stavola, L. A. Boatner, L. C. Feldman, N. H. Tolk, G. Lüpke

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Abstract

The vibrational lifetimes of the O-H and O-D stretch modes in the perovskite oxide KTaO3 are measured by pump-probe infrared spectroscopy. Both stretch modes are exceptionally long lived and exhibit a large "reverse" isotope effect, due to a phonon-assisted proton-tunneling process, which involves the O-Ta-O bending motion. The excited-state tunneling rate is found to be 7 orders of magnitude larger than from the ground state in the proton conducting oxide, BaCeO3.

Original languageEnglish
Article number075506
JournalPhysical review letters
Volume102
Issue number7
DOIs
Publication statusPublished - Feb 20 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Spahr, E. J., Wen, L., Stavola, M., Boatner, L. A., Feldman, L. C., Tolk, N. H., & Lüpke, G. (2009). Proton tunneling: A decay channel of the O-H stretch mode in KTaO3. Physical review letters, 102(7), [075506]. https://doi.org/10.1103/PhysRevLett.102.075506