Epitaxial Growth of Metal and Superconductor Oxide Films

摘要

In this presentation we will discuss the epitaxial growth of metal and superconductor oxide layers on bi-axial textured substrates. It is well established now that to obtain superior critical current densities for YBCO superconductors we need biaxially textured crystalline substrates. One way to accomplish biaxial texturing in a superconducting material is to grow epitaxial YBCO onto biaxial textured substrates. Superconducting oxide layers cannot be deposited directly on textured metal substrates for example Ni and Ni-W, and Cu since superconductors interact adversely with the substrate in a manner that degrades the superconductor material, especially during the high temperatures at which the superconductor materials are deposited or processed. It is also desirable to have a textured Ni layer on paramagnetic Ni-W substrate since Ni-W is more oxidative in nature. To overcome these adverse interactions, a buffer layer of material is often deposited between the substrate and the superconducting material to form a chemical barrier between the metal substrate and the superconductor. At present we are developing biaxial textured seed metal buffer layer materials inexpensively by electrodeposition method. We successfully electroplated biaxially textured Au on Ni, Ni-W and Cu and also Ni on Ni-W and Cu. In this meeting we will discuss the epitaxial growth of electrodeposited Ni and Au and also the superconducting YBCO material prepared epitaxially by PLD method.