Microwave absorption in a dc magnetic field up to 12 kG, attributed to nonequilibrium contributions to the ac susceptibility, appears at Tc as the sample is cooled. ESR measurements of Y-Ba-Cu-O show that Cu²⁺ exists only in the fraction of the sample which is not superconducting in a distorted octahedral surrounding.
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Durný et al. (1987) studied this question.
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