Reduced Nonlinearity Superconducting Thin Films to Transmit and Receive Applications

摘要

This project is directed towards the development of high performance large-area YBCO films on suitable single crystal substrates through modified TFA-MOD approach for transmit and receive applications. The research has lead to the state-of-the-art of development of high quality YBCO films on single crystal substrate with Tc(R=0)>92K and Jc>5MA/cm2. The linearity, surface resistance, and power handling capability of YBCO films developed in this research are greatly improved by the understanding and control of driving force and HF saturation in precursor during the conversion. Mechanism study indicates that layered growth is critical and can be realized by surface modification and nucleation control. A nucleation transition from dendrites to layered structure has been revealed. It has been approved that the modified TFA-MOD process is a very low cost route for YBCO fabrication and can be scaled up for high frequency applications.