Crystalline orientation of YBa2Cu3Oy film prepared by liquid-phase epitaxial growth on NdGaO3 substrate

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Abstract
Superconducting YBa2Cu3Oy films were grown by liquid‐phase epitaxy on NdGaO3(110) single‐crystalline substrates by a modified top‐seeded solution growth method. Two different melt compositions were used. In the case of Cu‐poor melt compositions (Ba:Cu=3.0:5.0), only c‐axis oriented growth was observed. However, if we used Cu‐rich melt compositions (Ba:Cu=3.0:6.5), both c‐axis and a‐axis oriented films were obtained. In the latter case the crystalline orientations of the YBa2Cu3Oy films were dependent on the temperature of the surface of the melt. At lower temperatures, c‐axis oriented films were obtained, whereas the films showed a‐axis orientation at higher temperatures. The width of the temperature region over which the orientation changes is less than 3 °C, which is very narrow compared to the width observed in conventional vapor phase depositions (typically 50 °C). We propose that changes in orientation during the liquid‐phase epitaxial growth is due to the unique properties of the phase diagram of the Y–Ba–Cu–O system.

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