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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

  • Hoppler, Justin Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Laboratory for Neutron Scattering, ETH Zurich Switzerland
  • Stahn, J. Laboratory for Neutron Scattering, ETH Zurich Switzerland
  • Bouyanfif, Houssny Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Malik, Vivek Kumar Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Patterson, B. D. Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland
  • Willmott, P. R. Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland
  • Cristiani, G. Max-Plank-Institut für Festkörperforschung Stuttgart, Germany
  • Habermeier, H.-U. Max-Plank-Institut für Festkörperforschung Stuttgart, Germany
  • Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
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    29.10.2008
Published in:
  • Physical Review B. - 2008, vol. 78, no. 13, p. 134111
barium compounds
calcium compounds
high-temperature superconductors
lanthanum compounds
multilayers
praseodymium compounds
reflectometry
solid-state phase transformations
superlattices
X-ray diffraction
yttrium compounds
English We investigated with synchrotron x-ray diffraction and reflectometry the formation of structural domains in the near-surface region of single crystalline SrTiO₃ (001) substrates with Y0.6Pr0.4Ba₂Cu₃O₇/La2/3Ca1/3MnO₃ superlattices grown on top. We find that the antiferrodistortive cubic to tetragonal transition, which occurs at TSTO=104  K in the bulk and at a considerably higher temperature of at least 120 K in the surface region of SrTiO₃, has only a weak influence on the domain formation. The strongest changes occur instead in the vicinity of the tetragonal to orthorhombic transition in SrTiO₃ around 65 K where pronounced surface facets develop that reach deep (at least several micrometers) into the SrTiO₃ substrate. These micrometer-sized facets are anisotropic and tilted with respect to one another by up to 0.5° along the shorter direction. Finally, we find that a third structural transition below 30 K gives rise to significant changes in the spread of the c-axis parameters. Overall, our data provide evidence for a strong mutual interaction between the structural properties of the SrTiO₃ surface and the multilayer grown on top.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/300777
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