Experimental evidence for oxygen sublattice control in polar infinite layer SrCuO2

D. Samal, Haiyan Tan, H. Molegraaf, B. Kuiper, W. Siemons, S. Bals, J. Verbeeck, G. van Tendeloo, Y. Takamura, E. Arenholz, Catherine A. Jenkins, G. Rijnders, Gertjan Koster

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Abstract

A recent theoretical study [Phys. Rev. B 85, 121411(R) (2012)] predicted a thickness limit below which ideal polar cuprates turn nonpolar driven by the associated electrostatic instability. Here we demonstrate this possibility by inducing a structural transformation from the bulk planar to chainlike structure upon reducing the SrCuO 2 repeat thickness in SrCuO 2 /SrTiO 3 superlattices with unit-cell precision. Our results, based on structural investigation by x-ray diffraction and high resolution scanning transmission electron microscopy, demonstrate that the oxygen sublattice can essentially be built by design. In addition, the electronic structure of the chainlike structure, as studied by x-ray absorption spectroscopy, shows the signature for preferential hole occupation in the Cu 3d 3z 2 −r 2 orbital, which is different from the planar case.
Original languageEnglish
Article number096102
Number of pages5
JournalPhysical review letters
Volume111
Issue number9
DOIs
Publication statusPublished - 2013

Keywords

  • METIS-298379
  • IR-90014

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