Preparation of superconducting YBa{sub}2Cu{sub}3O{sub}(7-x) films on metallic substrates by pulsed laser deposition

摘要

The YBa{sub}2Cu{sub}3O{sub}(7-x)(YBCO) superconducting thin films with Tc(R=0) of 84K and Jc of 2×10{sup}3A/cm{sup}2 at 77K, on polycrystalline Ni-based alloys with buffer layers of Yttria-Stabilized-Zirconia (YSZ), have been prepared in situ byexcimer laser. The orientation of laser- deposited YSZ buffer layers on NiCr alloys can be improved by choosing the suitable preparing parameters. The microstructure of YBCO thin films, investigated with a scanning tunneling microscopy, shows that thespiral growth structure may be an important characteristic of the high quality YBCO superconducting thin films.