Research Papers in Physics and Astronomy


Date of this Version

August 1987


Published by American Physical Society. Physics Review B 36, 2361 (1987). Copyright © 1987 American Physical Society. Permission to use.


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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