Abstract
We have measured the electrical properties of YB 2Cu 3O y/SrTiO 3/YB 2Cu 3O y (YBCO/STO/YBCO) multilayers prepared by the pulsed laser deposition method under the various deposition conditions of insulating STO layer. Superconducting properties of both YBCO layers are sensitively affected by the deposition temperature, T s , of insulating STO layer. T c of lower YBCO layer is decreased due to the oxygen loss during the deposition of STO layer, but the superconductivity of upper YBCO layer is severely deteriorated due to the poor crystalline quality for low T s . However, we have successfully fabricated YBCO/STO/YBCO multilayer with T c( zero) above 85 K for both YBCO micro-bridges of 50 μm width by depositing the insulating STO layer progressively at T s = 550°C and 780°C. The resistivity of both YBCO layers at room temperature is below 1.0 mΩ.cm.
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