Relationship between the surface resistance and crystal orientation of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin film

We have examined the relationship between in-plane orientation, grain size, fluctuation of grain axis and surface resistance of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) films, The surface resistance of YBCO films with a mixture of [100] and [110] in-plane grains was larger than that of the films with perfect in-plane orientation. The behavior of surface resistance could be explained by the degree of grain boundaries of [100] and [110] in-plane orientation. The surface resistance of YBCO films was proportion to the fluctuation of grain axis. It was also proven that surface resistance of high-temperature superconductors is affected by the critical current.