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Octahedral Distortions at High-Temperature Superconducting La2CuO4 Interfaces: Visualizing Jahn-Teller Effects

MPS-Authors
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Wang,  Y.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Sigle,  W.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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Cristiani,  G.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Logvenov,  G.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier,  J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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van Aken,  P. A.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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引用

Suyolcu, Y. E., Wang, Y., Sigle, W., Baiutti, F., Cristiani, G., Logvenov, G., Maier, J., & van Aken, P. A. (2017). Octahedral Distortions at High-Temperature Superconducting La2CuO4 Interfaces: Visualizing Jahn-Teller Effects. Advanced Materials Interfaces, 4(24):.


引用: https://hdl.handle.net/21.11116/0000-000E-D2A8-7
要旨
Tuning the octahedral network represents a promising route for achieving new properties and functionalities in perovskite-based oxide heterostructures. One of the interface-mediated phenomena occurring in complex oxides is the JahnTeller (JT) effect. With the purpose of investigating octahedral distortions at interfaces showing high-temperature interface superconductivity, atomic layer-by-layer oxide molecular-beam epitaxy grown bilayers consisting of three unit cells, overdoped metallic La1.6M0.4CuO4, and three unit cells undoped insulating La2CuO4, where M represents a divalent dopant (namely, Ba2+, Sr2+, and Ca2+), are studied. The local crystal structure, chemistry, and dopant distribution are probed by analytical spherical-aberration-corrected scanning transmission electron microscopy. Here, the interrelation between the cationic size mismatch between dopant (M2+) and host La3+ ions and the local structure are reported, and the impact of the dopant distribution on the structural (CuO6 octahedra elongation) local properties is discussed. A clear correlation between dopant size and local lattice deformations is highlighted. Moreover, a relation between the nature of superconductivity (bulk vs interface) and JT distortions of the anionic sublattice is suggested.