MICROWAVE MAGNETOABSORPTION IN C-AXIS-ORIENTED YBA2CU3O7 FILMS WITH COLUMNAR DEFECTS

We report on the temperature, angular, and frequency dependence of the microwave magnetoabsorption of YBa2Cu3O7 c-axis oriented thin films, Some of the films were measured as-grown (pristine) while others were irradiated with 250 MeV Ag+17 ions whose fluences ranged from 0.5 to 1 0 x 10(15) m(-2). By an extension of the viscously-damped-vortices mod el of Gittelman and Rosenblum in conjunction with the anisotropic scal ing of Blatter, Geshkenbein and Larkin, the various dependencies can b e described rather well. A phenomenological description of the magneto absorption for the damaged films is given.