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A theory of the cooperative Jahn-Teller effect is developed to elucidate a structural phase transition observed in the CsCuCl 3 crystal. This theory establishes the relationship between the local and the cooperative Jahn-Teller effect. We find that the helical alignment of Cl - ions along the c -axis agrees with experimental data when the two Δ 6 modes of the phonons executed by the Cl - ions contribute to the structutal phase transition.
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Teruo Ogihara (1995) studied this question.
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