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15 February 2025
 
  » arxiv » 2301.01406

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Atomic and Electronic Structures of Correlated SrRuO3/SrTiO3 Superlattices
Seung Gyo Jeong ; Ahmed Yousef Mohamed ; Deok-Yong Cho ; Woo Seok Choi ;
Date 4 Jan 2023
AbstractAtomic-scale precision epitaxy of perovskite oxide superlattices provides unique opportunities for controlling the correlated electronic structures, activating effective control knobs for intriguing functionalities including electromagnetic, thermoelectric, and electrocatalytic behaviors. In this study, we investigated the close interplay between the atomic and electronic structures of correlated superlattices synthesized by atomic-scale precision epitaxy. In particular, we employ superlattices composed of correlated magnetic SrRuO3 (SRO) and quantum paraelectric SrTiO3 (STO) layers. In those superlattices, RuO6 octahedral distortion is systematically controlled from 167 to 175 degrees depending on the thickness of the STO layers, also affecting the TiO6 octahedral distortion within the STO layer. Customized octahedral distortion within SRO/STO superlattices in turn modifies the electronic structures of both the Ti and Ru compounds, observed by X-ray absorption spectroscopy. Our results identify the close correlation between atomic lattice and electronic structures enabled by the facile controllability of atomic-scale epitaxy, which would be useful for designing future correlated oxide devices.
Source arXiv, 2301.01406
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