Orientation mechanism of liquid phase epitaxial grown YBa2Cu3O7-y film
Superconducting YBa2Cu3Oy films were grown by liquid-phase epitaxy (LPE) on NdGaO3(l10) single-crystalline substrate by a modified top-seeded crystal growth method. Two different melt compositions were used. In the case of Cu-poor melt composition (Ba:Cu=3.0:5.0), only c-axis oriented growth was observed. However, if we used Cu-rich melt composition (Ba:Cu=3.0:6.5), both c-axis and a-axis oriented films were obtained. In the latter case the crystalline orientation of YBa2Cu3Oy films was dependent on the temperature of the surface of the melt. At lower temperatures, c-axis orientation films were obtained, whereas the films showed a-axis orientation at higher temperatures. The width of transition temperature range of orientation is very narrow, less than 3 °C, compared to the width observed in the conventional vapor phase depositions (which is typically 50 °C). We propose that orientation change in the liquid phase epitaxial growth is determined by the unique properties of the phase diagram of Y-Ba-Cu-O-system.
KeywordsSubstrate Temperature Minimum Free Energy Liquid Phase Epitaxy Orientation Change Growth Interface
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- 3.M.Yoshida, T.Nakamoto, Y.Yamada, A.Tsuzuki, Y.Shiohara, I.Hirabayashi, and S.Tanaka, Advances in Superconductivity VI, ed. by T. Fujita and Y. Shiohara, Proceedings of 6th International Symposium of Superconductivity, Hiroshima, ( Springer, Tokyo 1993 ), p. 815.Google Scholar
- 5.C.P.Burmester, L.T.Wille, and R.Gronsky, Advances in Superconductivity V, ed. by Y. Bando and H. Yamauchi, Proceedings of 5th International Symposium of Superconductivity, Kobe, ( Springer, Tokyo 1993 ), p. 883.Google Scholar
- 7.A.C.Westerheim, S.N.Basu; D.Bhatt, M.C.Finn, Yu-Jahnes, R.L.Slattery, M.J.Cima, and A.C. Anderson, Fall Materials Research Society Meeting, Symposium H, Abstract, p. 832 (1991).Google Scholar