Which mechanism causes the sudden decrease of microwave loss in a resonant cavity housing a YBCO high-temperature superconductor below its critical temperature?

💡 Explanation

The Meissner effect causes flux expulsion; the superconductor removes magnetic fields because circulating supercurrents perfectly cancel the applied field. Therefore, microwave absorption decreases rapidly rather than increasing because energy loss through resistive heating vanishes below the critical temperature.

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