The three reorientation processes of O-2 centres in unstressed alkali halide crystals |
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Authors: | M. Bösch H.P. Dreyer J. Muggli W. Känzig |
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Affiliation: | Laboratorium für Festkörperphysik ETH Zürich, Switzerland |
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Abstract: | Measurements of the reorientation of O-2 centres in RbI and RbBr at low temperatures together with earlier measurements in different alkali halides suggest the following sequence of relaxation mechanisms in an unstressed srystal: Below about 3°K a one phonon tunneling process, then an activated tunneling process through the first librational state, and above 10°K a classical jumping process over the potential well. |
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