In-Situ Processing of Thin Films and Coated Wires of Novel High-Tc Superconductors

本工作研究了几种高T_c超导材料在添加了Bi、Tl和/或Sr的Y-Ba-Cu-0系中的薄膜和涂层的形成。将使用纳秒激光蒸发技术和快速热处理方法来稳定这些非平衡相。利用这些处理方法，可以增加CuO面数，从而提高超导转变温度T_c。将对激光蒸发过程进行建模，以了解和控制沉积过程，并在原位沉积和随后的退火过程中最小化总的热平衡。将详细研究薄膜的外延生长和织构，以达到最大的临界电流密度。

This work studies the formation of thin films and coatings of several high Tc Superconducting materials in the Y-Ba-Cu-0 base system with Bi, Tl and/or Sr additions. Nanosecond laser evaporation techniques and rapid thermal processing methods will be used to stabilize these non-equilibrium phases. Using these processing methods the number of Cu-O planes may be increased which also increases the superconducting transition temperature Tc. Modeling of the laser evaporation will be performed to understand and control the deposition process and to minimize the total thermal budget during in-situ deposition and subsequent annealing. The epitaxial growth and texturing of thin films to maximize critical current densities wil be investigated in detail.