Levelcrossing Experimente im Tm I-Spektrum |
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Authors: | R Wallenstein |
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Institution: | 1. Institut für Festk?rperforschung der Kernforschungsanlage Jülich, Germany
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Abstract: | A semi phenomenological dynamical theory for the rotations of the BO6 octahedra in ABO3 perovskites is proposed, which accounts for the soft mode and the central peak forT≧T c observed by neutron scattering in SrTiO3. The neutron scattering cross section is discussed. The EPR line width is predicted to diverge as ??ν(1–2η) and as ??ν(2–2η) for three- and two dimensional correlations with ?=(T-T c )/T c . The theory is generalized to other structural transitions. |
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