Experimental Evidence for Oxygen Sublattice Control in Polar Infinite Layer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SrCuO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Samal, D.; Tan, Haiyan; Molegraaf, Hajo; Kuiper, Bouwe; Siemons, Wolter; Bals, Sara; Verbeeck, Jo; Tendeloo, Gustaaf Van; Takamura, Yayoi; Arenholz, Elke; Jenkins, Catherine; Rijnders, Guus; Koster, Gertjan

doi:10.1103/physrevlett.111.096102

Cited by 32 publications

(31 citation statements)

References 27 publications

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“…However, the surface is slightly roughened when the thickness is increased to 9 unit-cell layers compared to the 3 unit-cell film. Similar behavior was found by Samal et al [128] in superlattice heterostructures for thicker SrCuO 2 layers. Since the observed roughness was smaller than the unit-cell height of SrCuO 2 , the effective thickness was not affected.…”

Section: Discussionsupporting

confidence: 88%

“…This indicates a change in electronic structure as also discussed by Samal et al [128] . More detailed analyses and further study using photoemission is of high interest for future developments, i.e., tuning the electronic properties.…”

Section: θ Peak Position and C-axissupporting

confidence: 78%

“…In the process of rearrangement of oxygen ions, the c-axis lattice parameter of the chain-type SrCuO 2 on SrTiO 3 is predicted to be increased by 0.5 Å as compared to the bulk-planar counterpart. In fact the recent study by D. Samal et al [128] demonstrated this effect, which clearly shows a change in the oxygen sublattice as a function of SrCuO 2 thickness in SrCuO 2 -SrTiO 3 superlattice heterostructures. In addition, the work by Aruta et al [129] on CaCuO 2 -SrTiO 3 superlattice heterostructures also hypothesized the possible formation of CuO chain-type layering at the interface, that in a way relieves the built-in electrostatic potential in CaCuO 2 .…”

Section: Introductionmentioning

confidence: 83%

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Size effects in epitaxial oxide thin films

Kuiper

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Cover Three dimensional impression of the formation of epitaxial nanowires on an ordered mixed terminated crystal surface. The light gray blocks at the bottom represent the different areas of surface mixed termination, e.g., DyO and ScO 2 in the case of DyScO 3 . The dark blocks represent complete perovskite blocks of deposited film material, e.g., SrRuO 3 . This type of nanowire formation is described in chapters three, four and five of this thesis. The picture is generated using POVRay software and is based on actual Monte Carlo simulation results.The research described in this thesis was carried out within the Inorganic Materials Science group, Department of Science and Technology and the MESA+ institute for Nanotechnology at the University of Twente. This work is financially supported by The Netherlands Organization for Scientific Research (NWO). Nanopatterned epitaxial oxide thin films IntroductionFabricating ever smaller devices which show ever more functionality is at the heart of modern day technological development in the field of electronics. This quest for smaller and more advanced electronics, requires the fabrication of components and structures with length-scales now reaching only several nanometers (a billionth of a meter). Material properties at the nanometer scale can be very different compared to their bulk counterparts. Volume to surface area ratios change and classical laws of physics cannot always be applied; quantum effects start to play a role. A famous quote from world-renowned physicist Feynman is often referred to in this regard:"There is plenty of room at the bottom."Richard Feynman, December 1959 [1] Although popular magazines discourage the use of this quote as introduction in scientific publications [2] along with Moore's law, it perfectly summarizes the motivation for much of the research done in the field of nanotechnology in the past years and nicely fits the work done in this thesis. While intrinsic (bulk) material properties may be lost or altered by size or quantum effects, new phenomena and properties can emerge, e.g., giant magnetoresistance, which is now commonly used in hard disk drives and sensor applications. [3,4] The fabrication process of these small structures or thin films is usually different compared to conventional patterning techniques. New fabrication processes must be developed in order to create functional patterns at the nanometer scale and characterization techniques, like electron microscopy, should be improved to allow for analyzing the resulting structures and properties. In this respect, the fundamental material properties, the fabrication process and characterization methods are coupled and all require a great amount of study.An interesting group of materials for both device fabrication and fundamental materials studies is the family of metal oxides. Within this group, the per-1 2 Nanopatterned epitaxial oxide thin films ovskite family contains a range of materials which all share a common oxygen backbone, with a multitude of different properties, e.g....

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Section: Discussionsupporting

confidence: 88%

Section: θ Peak Position and C-axissupporting

confidence: 78%

Section: Introductionmentioning

confidence: 83%

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Size effects in epitaxial oxide thin films

Kuiper

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“…20,[25][26][27] The goal to change the order parameter at the boundary between different structural, magnetic or electronic ground states using a FE is indeed a highly effective approach to designing functional interfacial properties. [28][29][30] Since neutrons are highly penetrating and sensitive to changes in the nuclear (n) and magnetic (m) scattering length densities (SLD) of a material at the atomic scale, the chemical and magnetic evolution of buried interfaces affected by charge depletion or accumulation can be detected as changes in the mSLD depth profile.…”

Section: Introductionmentioning

confidence: 99%

Enhancing interfacial magnetization with a ferroelectric

et al. 2016

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Ferroelectric control of interfacial magnetism has attracted much attention. However, the coupling of these two functionalities has not been understood well at the atomic scale. The lack of scientific progress is mainly due to the limited characterization methods by which the interface's magnetic properties can be probed at an atomic level. Here, we use polarized heterostructures. We find that the magnetization at the surfaces and interfaces of our LSMO films without PZT are always deteriorated and such magnetic deterioration can be greatly improved by interfacing with a strongly polar PZT film. Magnetoelectric coupling of magnetism and ferroelectric polarization was observed within a couple of nanometers of the interface via an increase in the LSMO surface magnetization to 4.0 µ B /f.u., a value nearly 70% higher than the surface magnetization of our LSMO film without interfacing with a ferroelectric layer. We attribute this behavior to hole depletion driven the by the ferroelectric polarization. These compelling results not only probe the presence of nanoscale magnetic suppression and its control by ferroelectrics, but also emphasize the importance of utilizing probing techniques that can distinguish between bulk and interfacial phenomena.

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“…Recently, the occurrence of similar structural conditions has been also foreseen in films of IL system ACuO 2 (A = Ca, Sr, Ba) in a theoretical paper by Zhong et al 7 and experimentally proven in the case of SrCuO 2 /SrTiO 3 superlattices. 8 Zhong et al 7 found that, in order to reduce the electrostatic instability, naturally present in these highly polar systems, the structure changes, below a critical ACuO 2 thickness, from the CuO 2 planar (IL) to a chain structure by a tilting of the 3 CuO 2 planes. This transition is obtained by moving oxygen atoms from the CuO 2 planes to the Ca planes, thus leading to the presence of apical oxygen.…”

mentioning

confidence: 99%

Raman spectroscopy study of the interface structure in (CaCuO₂)_n/(SrTiO₃)_m superlattices

Castro¹,

Caramazza²,

Innocenti³

et al. 2013

Appl. Phys. Lett.

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Raman spectra of CaCuO 2 /SrTiO 3 superlattices show clear spectroscopic marker of two structures formed in CaCuO 2 at the interface with SrTiO 3 . For non-superconducting superlattices, grown in low oxidizing atmosphere, the 425 cm -1 frequency of oxygen vibration in CuO 2 planes is the same as for CCO films with infinite layer structure (planar Cu-O coordination). For superconducting superlattices grown in highly oxidizing atmosphere, a 60 cm -1 frequency shift to lower energy occurs. This is ascribed to a change from planar to pyramidal Cu-O coordination because of oxygen incorporation at the interface. Raman spectroscopy proves to be a powerful tool for interface structure investigation. Superconductivity indeed does appear only if the superlattices are grown under strongly oxidizing conditions, due to extra oxygen ions entering at the interface. 4,5,6 The larger the number of these oxygen ions is, the higher the hole doping of the CCO block and the T c are (a maximum T c 40 K has been obtained). 4 Excess oxygen ions occupy the apical position for the Cu ions of the CuO 2 planes close to the interface. 4,5,6 Therefore, different structures are present in the CCO layers close to the boundaries with SrTiO 3 and in those ones far from them. Indeed, the latter should retain their IL structure, with purely planar Cu-O coordination, whereas pyramidal Cu-O coordination can occur in the former. Recently, the occurrence of similar structural conditions has been also foreseen in films of IL system ACuO 2 (A = Ca, Sr, Ba) in a theoretical paper by Zhong et al. 7 and experimentally proven in the case of SrCuO 2 /SrTiO 3 superlattices. 8 Zhong et al. 7 found that, in order to reduce the electrostatic instability, naturally present in these highly polar systems, the structure changes, below a critical ACuO 2 thickness, from the CuO 2 planar (IL) to a chain structure by a tilting of the 3 CuO 2 planes. This transition is obtained by moving oxygen atoms from the CuO 2 planes to the Ca planes, thus leading to the presence of apical oxygen.Raman spectroscopy demonstrated to be a powerful tool to investigate layered structures 9,10 and to provide a careful characterization of film samples. 11 In particular, in cuprates with IL structure, the effects of the hole doping of CuO 2 planes, obtained by either introduction of excess oxygen atoms 12 or excitation through the charge transfer gap, 13 has

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Experimental Evidence for Oxygen Sublattice Control in Polar Infinite LayerSrCuO2

Cited by 32 publications

References 27 publications

Size effects in epitaxial oxide thin films

Size effects in epitaxial oxide thin films

Enhancing interfacial magnetization with a ferroelectric

Raman spectroscopy study of the interface structure in (CaCuO₂)_n/(SrTiO₃)_m superlattices

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Experimental Evidence for Oxygen Sublattice Control in Polar Infinite LayerSrCuO2

Cited by 32 publications

References 27 publications

Size effects in epitaxial oxide thin films

Size effects in epitaxial oxide thin films

Enhancing interfacial magnetization with a ferroelectric

Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices

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Product

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Raman spectroscopy study of the interface structure in (CaCuO₂)_n/(SrTiO₃)_m superlattices