Abstract
Absorption of microwaves (9.3 GHz) was measured as a function of an external applied magnetic field in single crystals of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{\mathrm{x}}$. Three distinct types of signals were observed successively as the temperature was lowered from ${T}_{c}$ to 2.4 K. They differ in widths, angular dependences, and hysteretic properties. We discuss possible microwave loss mechanisms and a model based on internal Josephson junctions to explain our observation.
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