Abstract
The observed low-field microwave absorption below T c in high- T c superconducting cuprates is discussed. It is found that the theory based on the granular structure of the ceramic oxides, which interprets the signal as a nonresonant microwave absorption, has difficulty in giving a reasonable explanation to the experimental facts. On the other hand, no present theory provides a mechanism, involving either spin or charge degrees of freedom, to the conjecture of copper-ion pairs. It is proposed that the low-field absorption of microwaves in high- T c superconducting cuprates might be the superposition of both nonresonance and spin-resonance microwave absorptions.
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