Epitaxial Growth of 2G HTS Films in the Process of Pulsed Laser Deposition

ABSTRACT This graduation project is devoted to epitaxial growth of second generation HTS films by pulsed laser deposition. It consists of three parts: theoretical, methodological and experimental. In the theoretical part of the graduation project is given a literature review on such topics as: I and II generation of HTS and approaches of texturing substrates. Further, the most common architecture in HTSC tapes obtained by pulsed laser deposition is described. This section also contains information about peculiarities of high-temperature superconducting layer growth that scientific groups face nowadays. The project’s second part introduces the description of pulsed laser deposition methodas well as the analytical techniques that have been used in sample studying. The names and characteristics of installations used in the project are given likewise. The experimental section of the project consists of four parts. The first part is devoted to textured metal substrates Ni-W as well as their biaxial texture. The second part is dedicated to the growth of the buffer layers as well as the influence of growth parameters on the structure is investigated. The third part describes the process of formation of the HTSC layer, and the dependence of the formation of a-oriented crystallites from the deposition temperature and the thickness of the epitaxial layers is studied. The last section is devoted to growth parameters of the YBCO layer optimization in order to improve current-carrying capabilities of the tapes. The graduation project consists of: pages - 48, illustrations – 30, tables – 2, references – 25 titles.