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Anticrossing signals are observed in the scattering of thermal phonons by Fe 2 +ions in Al 2 0 3 when two ground state levels are brought close together by a magnetic field. The width of the signal is proportional to the matrix element coupling the two levels. The existence of a ground state anticrossing signal is attributed to the nonlinearity in the strong scattering regime.
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Anderson et al. (1974) studied this question.
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