Orbital reconstruction in nonpolar tetravalent transition-metal oxide layers
| Autor: | Vladislav Kataev, Viktor Yushankhai, Vamshi M. Katukuri, Judit Romhányi, Bernd Büchner, Nikolay A. Bogdanov, Liviu Hozoi, Jeroen van den Brink |
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| Rok vydání: | 2016 |
| Předmět: |
Multidisciplinary
Materials science Strongly Correlated Electrons (cond-mat.str-el) Oxide General Physics and Astronomy chemistry.chemical_element FOS: Physical sciences Heterojunction Context (language use) Nanotechnology General Chemistry General Biochemistry Genetics and Molecular Biology Article law.invention Tetragonal crystal system chemistry.chemical_compound Condensed Matter - Strongly Correlated Electrons Transition metal chemistry law Chemical physics Iridium Electron paramagnetic resonance Quantum |
| Zdroj: | Nature Communications |
| DOI: | 10.48550/arxiv.1604.07780 |
| Popis: | A promising route to tailoring the electronic properties of quantum materials and devices rests on the idea of orbital engineering in multilayered oxide heterostructures. Here we show that the interplay of interlayer charge imbalance and ligand distortions provides a knob for tuning the sequence of electronic levels even in intrinsically stacked oxides. We resolve in this regard the d-level structure of layered Sr2IrO4 by electron spin resonance. While canonical ligand-field theory predicts g||-factors less than 2 for positive tetragonal distortions as present in Sr2IrO4, the experiment indicates g|| is greater than 2. This implies that the iridium d levels are inverted with respect to their normal ordering. State-of-the-art electronic-structure calculations confirm the level switching in Sr2IrO4, whereas we find them in Ba2IrO4 to be instead normally ordered. Given the nonpolar character of the metal-oxygen layers, our findings highlight the tetravalent transition-metal 214 oxides as ideal platforms to explore d-orbital reconstruction in the context of oxide electronics. The iridate compounds display interesting physical properties, including quasi-two-dimensional behaviour similar to cuprates. Bogdanov et al. explore the d-level structure of Sr2IrO4 using electron spin resonance measurements and detailed calculations and find it is inverted compared to its normal ordering |
| Databáze: | OpenAIRE |
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