Abstract
ABSTRACTA series of c-axis oriented high temperature superconductor superlattices YBa2Cu3O7 , fPrBa2Cu3O7 weresynthesized using dc magnetron sputtering. We varied the thickness of intervening PrBa2Cu3O7 layers as two, four, andeight unit cells with each individual YBa2Cu3O7 layer fixed to eight-unit-cell thick. X-ray diffraction (XRD) analysisindicates that these specimens were grown epitaxially having a rather satisfactory superlattice modulation along the c-axis.Furthermore, Atomic Force Microscope (AFM) images show that surfaces are very smooth. Shaped into a hall bar geometry, we have investigated its transport properties, including resistivity, current-voltage characteristics, and noise. In the superconducting transition region, the electrical conduction of these specimens was found to be influenced by dissociatedfree vortices. This was evident from the resistive transition and current-voltage characteristics, which are well explained byBardeen-Stephen (BS) model and Kosterlitz-Thouless (KT) transition theory, respectively. KT transition temperaturesdetermined from the resistance fittings and current-voltage characteristics were in good agreement. Somewhat complexfeatures were observed in the noise measurement with the variation of the transport current and the external magnetic field.
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