Raman scattering studies of YBa2Cu3O7-x thin films grown by chemical vapor deposition and metal-organic deposition

초록

We present results of Raman scattering studies of superconducting YBa2Cu3O7-x (YBCO) films grown by chemical vapor deposition and metal-organic deposition methods. It is shown by X-ray diffraction that all the as-grown YBCO films have a highly c-axis oriented and in-plane aligned texture. Raman scattering measurements were used to investigate optical phonon modes, oxygen contents, structural properties, and second-phases of the YBCO coated conductors. Raman spectra of YBCO films with lower-transport qualities exhibit additional phonon modes at similar to 300 cm(-1), similar to 600 cm(-1), and similar to 630 cm(-1), which are related to second-phases such as Ba2Cu3O5.9 and BaCuO2. Our results strongly suggest that Raman scattering be useful for optimizing YBCO film growth conditions. (C) 2007 Elsevier B.V. All rights reserved.

키워드