GROWTH OF (YBACUO)(M) (PRBACUO)(N) SUPERLATTICES BY MOCVD/

[(YBaCuO)(m) / (PrBaCuO)(n)](10) multilayers have been deposited by Me tal Organic Chemical Vapor Deposition (MOCVD). The films grow on SrTiO 3 (100) and MgO (100) substrates and have c-axis perpendicular to the substrate. A serie of superlattices has been synthesised with differen t deposition temperatures ranging between 700 and 850 degrees C with d ifferent modulations (the thickness of YBCO layers staying unchanged a nd equal to 100 Angstrom). The elements concentrations profiles at the interfaces and the interdiffusion were determined by secondary neutra l mass spectroscopy (SNMS). X-ray diffraction show satellite peaks (ch aracteristic of superlattice modulation) around 001 and 002 reflection s. Moreover, the samples show a good in-plane orientation. The superco nducting properties are analysed by AC screening. The critical tempera ture reaches 88K in the case of m=8 and n=2 (n and m being the numbers of units cells along c-axis for YBCO layer and PBCO one respectively) .