Inhibition of Thickness Effect and Enhancement of Superconductivity in YGdBCO/STO/YGdBCO Tri-Layer Film

Abstract

The limited critical current, attributed to the thickness effect, has been a serious restriction to the large-scale application of ReBa2Cu3O7-8 coated conductor. Hence, a YGdBCO/STO/YGdBCO tri-layer film was fabricated by pulse laser deposition method to successfully inhibit the thickness effect and improve the superconductivity of ReBa2Cu3O7-8 film. By inserting STO interlayer, the critical current of the YGdBCOfilm significantly increased from 180 A to 250 A. We found that the incompletely oxidized particles and the uncoated areas of the STO layer can serve as channels for the transmit of the current between YGdBCO layers.