Abstract
Direct microwave absorption was studied as a function of magnetic field up to 8 kG and in a temperature range between 10 K and 150 K in Y 1Ba 2Cu 3O 7− x . Large microwave absorption was observed below T c over a wide magnetic field range. The microwave power absorption is approximately described by I= A( T) H+ C( T), where A( T) and C( T) are temperature dependent constants. A( T) is proportional to the square root of the microwave power, while C( T) shows a different behaviour. We propose different origins for A( T) and C( T), namely fluxons in grains and weak Josephson links. Moreover, also flux trapping was observed in the superconducting state. Possible mechanisms for the absorption are discussed.
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