Structure of the mixed state induced by the field of a small ferromagnetic particle in thin superconducting films YBaCuO

Temperature dependence of the local energy barrier value for formation of mixed state in YBaCuO fine film superconducting specimens was determined experimentally. The measurement technique was based on application of a small ferromagnetic particle as a source of magnetic field. It was revealed that the energy barrier to initiate vortices (at field orientation parallel to CuO facets) was abnormally small, while dependence of jc(T) respective threshold current differed essentially from temperature dependence of un-pairing current. The experimental facts were interpreted in terms of the model of the Josephson medium. The observed jc temperature dependence showed strong suppression of the order superconducting parameter at the intergranular boundaries