PINNING CENTERS IN YBA2CU3O7-DELTA THICK-FILMS PREPARED ON Y2BACUO5 SUBSTRATES BY THE PAINTING-ON METHOD

The preparation technology of YBa2Cu3O7-delta (delta<<1) thick films o n Y2BaCuO5 substrates with micrometer inclusions of Y2BaCuO5 particles as pinning centers of magnetic vortex is presented. The pinning abili ties of these inclusions have been analyzed by investigating the tempe rature and field dependences of AC magnetic susceptibilities of the fi lms. It was found, that in the films with the inclusions educed in the three-minute partial melting of the YBa2CU3O7-delta phase at 985 degr ees C followed by the cooling to 920 degrees C with the rate of 1 degr ees C/min the pinning force is increased by half of one order of magni tude in comparison with the films without ones.