We have studied the influence of substrate matching and growth temperature on the morphology of YBa2Cu3O7-x: ultrathin film. For films grown on SrTiO3 and NdGaO3 substrates, we observed a temperature-dependent surface morphology. The film changed from a smooth epitaxial layer at growth temperatures equal to or below 750°C, into one with several unit-cell-high islands at 800°C. It was also found that the density of these islands differs between films on SrTiO3 and NdGaO3 substrates. This substrate-dependent island density was interpreted in terms of the Stransky-Krastanov-type film structure model together with an assumed temperature dependence of the epitaxial layer thickness.
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Issue number||8 PART A|
|Publication status||Published - Aug 1 1996|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)