Peculiarities of microwave absorption on Abrikosov's whirl oscillation in hard superconductors

A study was made on microwave absorption in type-2 superconductors with accounting for Abrikosov's vortex pinning on large-scale heterogenetics. Experimentally observed hysteresis of field dependence of absorption was shown to be explained with the framework of concepts about superconductor critical state. The relationship of hysteresis loop height to critical current value was established as well as the dependence of absorbed power on external field frequency. It was revealed that the frequency characteristic of transition to well determined surface resistance was not directly concerned with vortex pinning value. It is mainly determined by resistance of normal phase and by magnetic field intensity in specimens