Interfacial intermixing in Sr<scp>R</scp>u<scp>O</scp>3/<scp>P</scp>r0.7<scp>C</scp>a0.3<scp>M</scp>n<scp>O</scp>3 epitaxial superlattices: A <scp>HAADF</scp>‐<scp>STEM</scp> study

Hillebrand, R.; Pippel, Eckhard; Vrejoiu, Ionela; Hesse, D.

doi:10.1002/pssa.201329332

Cited by 4 publications

(2 citation statements)

References 29 publications

(36 reference statements)

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“…While electron microscopy investigations indicated the Sr concentration profile is abrupt at the downward side of the interface, this was found to be rather diffused at the upward side. Such asymmetric profiles have been observed in the literature for semiconductors and oxides not only in the case of delta-doped structures, but more in general for heterostructures, in which different phases are put into contact. ,, Here, the interface abruptness was found to be highly dependent on the growth sequence. ,− Several models have been proposed for rationalizing these experimental findings; surface roughness, surface chemistry, and presence of surface high-dimensional defects have been indicated as potential drivers. , Given the profound impact that the chemical composition of the interfacial layers may have on the final functional properties of oxide systems, − it is of crucial importance to further investigate the cationic intermixing at the interface. In this work, we performed a detailed investigation of the role played by different parameters in the definition of the interface chemical composition in two-dimensionally doped La 2 CuO 4 , addressing also the relation between the microstructure and the functional properties at the interface.…”

Section: Introductionmentioning

confidence: 81%

Cationic Redistribution at Epitaxial Interfaces in Superconducting Two-Dimensionally Doped Lanthanum Cuprate Films

Baiutti

Gregori

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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The exploration of interface effects in complex oxide heterostructures has led to the discovery of novel intriguing phenomena in recent years and has opened the path toward the precise tuning of material properties at the nanoscale. One recent example is space-charge superconductivity. Among the complex range of effects which may arise from phase interaction, a crucial role is played by cationic intermixing, which defines the final chemical composition of the interface. In this work, we performed a systematic study on the local cationic redistribution of two-dimensionally doped lanthanum cuprate films grown by oxide molecular beam epitaxy, in which single LaO layers in the epitaxial crystal structure were substituted by layers of differently sized and charged dopants (Ca, Sr, Ba, and Dy). In such a model system, in which the dopant undergoes an asymmetric redistribution across the interface, the evolution of the cationic concentration profile can be effectively tracked by means of atomically resolved imaging and spectroscopic methods. This allowed for the investigation of the impact of the dopant chemistry (ionic size and charge) and of the growth conditions (temperature) on the final superconducting and structural properties. A qualitative model for interface cationic intermixing, based on thermodynamic considerations, is proposed. This work highlights the key role which cationic redistribution may have in the definition of the final interface properties and represents a further step forward the realization of heterostructures with improved quality.

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Section: Introductionmentioning

confidence: 81%

Cationic Redistribution at Epitaxial Interfaces in Superconducting Two-Dimensionally Doped Lanthanum Cuprate Films

Baiutti

Gregori

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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“…Low magnification HAADF-STEM micrographs taken in different locations along the specimens allowed us to observe that the layers were uniform over at least few microns lateral size (see figures 1(a) and (b)). The interfaces between the SRO and PCMO layers were sharp and their atomic structure was analyzed in greater detail in earlier papers, finding an asymmetry of intermixing at the SRO-on-PCMO and the PCMO-on-SRO interfaces [17,21]. The interfaces were proven to be affected by intermixing over two (PCMO-on-SRO) or one (SRO-on-PCMO) lattice planes.…”

Section: Structural Characterizationmentioning

confidence: 91%

Unconventional anomalous Hall effect driven by oxygen-octahedra-tailoring of the SrRuO₃ structure

2019

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The anomalous Hall effect of SrRuO 3 is of special interest, since Weyl nodes appear in the band structure and lead to an unconventional temperature dependence of the anomalous Hall constant. Moreover, it has been proposed that coupling of SrRuO 3 films to materials with strong spin-orbit coupling or with ferroelectric or ferromagnetic order might lead to the formation of skyrmions and a topological contribution to the Hall effect. This latter conjecture is strongly debated. We probed this proposal by interfacing thin SrRuO 3 layers to Pr 0.7 Ca 0.3 MnO 3 , since it is known that the strong antiferromagnetic coupling between these two ferromagnets leads to complex magnetization states. Superlattices with sharp interfaces were grown by pulsed-laser deposition. The epitaxial interfacing with the Pr 0.7 Ca 0.3 MnO 3 layers led to major modifications of the structural symmetry of the SrRuO 3 layers. High resolution scanning transmission electron microscopy revealed that the individual SrRuO 3 layers of the superlattices had heterogeneous structure with varying oxygen octahedral tilt angles across the layers, turning their structure to be tetragonal-like, with largely suppressed octahedral tilts when the thickness of the neighboring Pr 0.7 Ca 0.3 MnO 3 layers was increased. These structural modifications were accompanied by major changes in the field dependence of the Hall signal with the mainly tetragonal SrRuO 3 layers showing features strongly reminiscent of a topological Hall effect. However, since there was an intimate link between Hall effect and structure, the Hall data were interpreted as arising from a superposition of Hall effect contributions from tetragonal and orthorhombic SrRuO 3 sub-layers.

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Correlated Quantum Phenomena of Spin–Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO₃ and SrIrO₃ Based Artificial Superlattices

Jeong

Lin

et al. 2023

Adv Funct Materials

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Unexpected, yet useful functionalities emerge when two or more materials merge coherently. Artificial oxide superlattices realize atomic and crystal structures that are not available in nature, thus providing controllable correlated quantum phenomena. This review focuses on 4d and 5d perovskite oxide superlattices, in which the spin–orbit coupling plays a significant role compared with conventional 3d oxide superlattices. Modulations in crystal structures with octahedral distortion, phonon engineering, electronic structures, spin orderings, and dimensionality control are discussed for 4d oxide superlattices. Atomic and magnetic structures, Jeff = 1/2 pseudospin and charge fluctuations, and the integration of topology and correlation are discussed for 5d oxide superlattices. This review provides insights into how correlated quantum phenomena arise from the deliberate design of superlattice structures that give birth to novel functionalities.

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Interfacial intermixing in SrRuO₃/Pr_0.7Ca_0.3MnO₃ epitaxial superlattices: A HAADF‐STEM study

Cited by 4 publications

References 29 publications

Cationic Redistribution at Epitaxial Interfaces in Superconducting Two-Dimensionally Doped Lanthanum Cuprate Films

Cationic Redistribution at Epitaxial Interfaces in Superconducting Two-Dimensionally Doped Lanthanum Cuprate Films

Unconventional anomalous Hall effect driven by oxygen-octahedra-tailoring of the SrRuO₃ structure

Correlated Quantum Phenomena of Spin–Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO₃ and SrIrO₃ Based Artificial Superlattices

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Interfacial intermixing in SrRuO3/Pr0.7Ca0.3MnO3 epitaxial superlattices: A HAADF‐STEM study

Cited by 4 publications

References 29 publications

Cationic Redistribution at Epitaxial Interfaces in Superconducting Two-Dimensionally Doped Lanthanum Cuprate Films

Cationic Redistribution at Epitaxial Interfaces in Superconducting Two-Dimensionally Doped Lanthanum Cuprate Films

Unconventional anomalous Hall effect driven by oxygen-octahedra-tailoring of the SrRuO3 structure

Correlated Quantum Phenomena of Spin–Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO3 and SrIrO3 Based Artificial Superlattices

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Product

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Interfacial intermixing in SrRuO₃/Pr_0.7Ca_0.3MnO₃ epitaxial superlattices: A HAADF‐STEM study

Unconventional anomalous Hall effect driven by oxygen-octahedra-tailoring of the SrRuO₃ structure

Correlated Quantum Phenomena of Spin–Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO₃ and SrIrO₃ Based Artificial Superlattices