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A possible pairing mechanism involving the collective oscillations (‘‘dipolons’’) of the crystal-field-generated dipoles of the oxygen ions in the CuO2 planes in the superconductor YBa2Cu3O7−δ has been used to estimate, in the framework of the BCS theory, the variation of Tc as a function of δ, which compares very well with the experimental observations.
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Sharma et al. (1989) studied this question.
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