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We investigated with synchrotron x-ray diffraction and reflectometry theformation of structural domains in the near-surface region of singlecrystalline SrTiO3 (001) substrates with Y0.6Pr0.4Ba2Cu3O7 / La2/3Ca1/3MnO3superlattices grown on top. We find that the antiferrodistortivecubic-to-tetragonal transition, which occurs at T_STO = 104K in the bulk and ata considerably higher temperature of at least 120K in the surface region ofSrTiO3, has only a weak influence on the domain formation. The strongestchanges occur instead in the vicinitiy of the tetragonal-to-orthorhombictransition in SrTiO3 around 65K, where pronounced surface facets develop thatreach deep (at least several micrometers) into the SrTiO3 substrate. Thesemicrometer-sized facets are anisotropic and tilted with respect to one anotherby up to 0.5deg along the shorter direction. Finally, we find that a thirdstructural transition below 30K gives rise to significant changes in the spreadof the c-axis parameters. Overall, our data provide evidence for a strongmutual interaction between the stuctural properties of the SrTiO3 surface andthe multilayer grown on top.

physical review. b, condensed matter and materials physics

X-ray study of structural domains in the near-surface region of  SrTiO3-substrates with Y0.6Pr0.4Ba2Cu3O7$ / La2/3Ca1/3MnO3 superlattices  grown on top