A. Rastogi et al., EFFECTS OF GRANULARITY ON MAGNETIC-FIELD DEPENDENT MICROWAVE RESPONSEAND SURFACE DEGRADATION IN THIN-FILMS OF YBA2CU3O7-DELTA, Solid state communications, 98(1), 1996, pp. 77-81
The magnetic field dependent microwave power loss in thin films of YBa
2Cu3O7-delta is analysed using the technique of non-resonant microwave
absorption. The loss is correlated to the surface quality, specifical
ly to the granularity of the film as determined by scanning electron m
icroscopy and atomic force microscopy. We also observe that a granular
surface is sensitive to degradation under aqueous attacks.