Effects of Ba Ratio on Properties of YBCO Film Prepared by MOCVD

doi:10.3724/SP.J.1077.2014.13277

Abstract

Abstract:

YBa₂Cu₃O_7-_x(YBCO) films were deposited on single crystal LaAlO₃(001) substrates by MOCVD with the single source system and flash evaporation mode. The effects of Barium content on the composition, microstructure and current carrying capacity of YBCO superconducting films were systematically investigated. The results demonstrated that CuO grains were inclined to form in YBCO films with lower Ba content. As Ba content increasing, Ba₂CuO₃grains began to form and the size of the grain kept increased. The amount and size of the second phase and its lattice match with YBCO played important roles in biaxial epitaxial growth and current carrying capability of YBCO films. When the mole ratio of Ba/Y is 3.9 in precursor, the 300 nm-thickness YBCO superconducting film with good in-plane and out-of-plane texture have been successfully fabricated, showing the critical current density (J_c at self-field, 77 K) of 4.0 MA/cm² measured by induction method.

Key words: MOCVD, YBCO, high temperature superconducting, critical current density

CLC Number:

TQ26

LIU Xin, XIONG Jie, ZHANG Fei, ZHAO Xiao-Hui, ZHAO Rui-Peng, TAO Bo-Wan. Effects of Ba Ratio on Properties of YBCO Film Prepared by MOCVD[J]. Journal of Inorganic Materials, 2014, 29(3): 275-278.

Figures/Tables 5

Fig. 1 XRD patterns of YBCO films with different Ba/Y ratios

Fig. 2 The dependence of FWHM values of YBCO(005) rocking curve on Ba content. The inset is YBCO(005) rocking curve at Ba/Y=3.9

Fig. 3 The dependence of FWHM values of YBCO(103) φ-scans on Ba content. The inset is φ-scan curve of YBCO film grown at Ba/Y=3.9

Fig. 4 SEM images of YBCO films with different Ba/Y (a) Ba/Y=3.3; (b) Ba/Y=3.6; (c) Ba/Y=3.9; (d) Ba/Y=4.2

Fig. 5 The relationship between critical current density (Jc) and Ba/Y ratio of YBCO film

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