EFFECT OF MAGNETIC-FLUX TRAPPED IN INTERGRANULAR SPACE ON MAGNETIC-FIELD DEPENDENCES OF RF ABSORPTION IN HTS MATERIALS

Dependences of rf absorption in HTS ceramic samples on a magnetic fiel d H<H-clg (H-clg is the lower critical field for granules) have been i nvestigated. Some features of these dependences cannot be described by the standard model of critical states, taking into account magnetic f lux trapping only in granules. A new electrodynamic model, taking into account qualitatively the magnetic flux trapping both in granules and in the intergranular space is proposed. The modified model makes it p ossible to explain all the currently observed peculiarities in the mag netic-field dependences of rf absorption both for H>H-clg and for H<H- clg. (C) 1997 American Institute of Physics.