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Abstract
Field modulated microwave absorption has been studied in the superconducting state of epitaxial YBa 2Cu 3O 7 thin films prepared by MOCVD. Even harmonics of the modulation field frequency in the Fourier spectrum of the reflected microwave power have been observed. Their amplitude decreases with increasing the dc field superimposed on the ac field and vanishes above a characteristic field B ∗. We show that the B ∗(T) curve can be viewed as an irreversibility line which we compare to that obtained from irreversible magnetization measurements.
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