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

doi:10.1103/PhysRevLett.111.096102

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 language	English
Article number	096102
Number of pages	5
Journal	Physical review letters
Volume	111
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.111.096102
Publication status	Published - 2013

Keywords

METIS-298379
IR-90014

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title = "Experimental evidence for oxygen sublattice control in polar infinite layer SrCuO2",

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.",

keywords = "METIS-298379, IR-90014",

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

year = "2013",

doi = "10.1103/PhysRevLett.111.096102",

language = "English",

volume = "111",

journal = "Physical review letters",

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TY - JOUR

T1 - Experimental evidence for oxygen sublattice control in polar infinite layer SrCuO2

AU - Samal, D.

AU - Tan, Haiyan

AU - Molegraaf, H.

AU - Kuiper, B.

AU - Siemons, W.

AU - Bals, S.

AU - Verbeeck, J.

AU - van Tendeloo, G.

AU - Takamura, Y.

AU - Arenholz, E.

AU - Jenkins, Catherine A.

AU - Rijnders, G.

AU - Koster, Gertjan

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

KW - METIS-298379

KW - IR-90014

U2 - 10.1103/PhysRevLett.111.096102

DO - 10.1103/PhysRevLett.111.096102

M3 - Article

SN - 0031-9007

VL - 111

JO - Physical review letters

JF - Physical review letters

IS - 9

M1 - 096102

ER -

Experimental evidence for oxygen sublattice control in polar infinite layer SrCuO2

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Keywords

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