MOCVD of superconducting oxides, heterostructures and superlattices

Superconducting YBa2Cu3O7 thin films have been grown by Injection MOCVD on different kind of monocristalline substrates :MgO, NdGaO3, LaAlO3 with crit ical current densities Jc(77K) over 10(6)A/cm(2) on all of these substrates and up to 7.10(6)A/cm(2) on LaAlO3. Heterostructures have been grown on me tallic substrates with convenient YSZ buffer. Biaxially textured YBCO films have been realized with Jc(77K) = 5.10(5)A/cm(2). Other heterostructures w ith an active dielectric SrTiO3 layer have been grown for tunable microwave devices applications with promising properties. Finally Injection MOCVD ha s shown to be well adapted for the formation of multilayers and superlattic es with a control of the layer thickness in the range of one unit cell. YBa 2Cu3O7 .delta/PrBa2Cu3O7 .delta superlattices have been grown with anisotro pic superconducting properties which can be tailored by changing the layer thickness of both superconducting and insulating layer.