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Superconducting Sr2RuO4Thin Films without Out-of-Phase Boundaries by Higher-Order Ruddlesden-Popper Intergrowth

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Title
Superconducting Sr2RuO4Thin Films without Out-of-Phase Boundaries by Higher-Order Ruddlesden-Popper Intergrowth
Author(s)
Jinkwon Kim; Junsik Mun; Palomares Garciá, Carla M.; Bongju Kim; Perry, Robin S.; Jo, Yongcheol; Im, Hyunsik; Han Gyeol Lee; Eun Kyo Ko; Chang, Seo Hyoung; Chung, Suk Bum; Miyoung Kim; Robinson, Jason W. A.; Yonezawa, Shingo; Maeno, Yoshiteru; Lingfei Wang; Tae Won Noh
Publication Date
2021-05
Journal
Nano Letters, v.21, no.10, pp.4185 - 4192
Publisher
American Chemical Society
Abstract
© 2020 American Chemical Society. All rights reserved.Ruddlesden-Popper (RP) phases (An+1BnO3n+1, n = 1, 2,···) have attracted intensive research with diverse functionalities for device applications. However, the realization of a high-quality RP-phase film is hindered by the formation of out-of-phase boundaries (OPBs) that occur at terrace edges, originating from lattice mismatch in the c-axis direction with the A′B′O3 (n = ∞) substrate. Here, using strontium ruthenate RP-phase Sr2RuO4 (n = 1) as a model system, an experimental approach for suppressing OPBs was developed. By tuning the growth parameters, the Sr3Ru2O7 (n = 2) phase was formed in a controlled manner near the film-substrate interface. This higher-order RP-phase then blocked the subsequent formation of OPBs, resulting in nearly defect-free Sr2RuO4 layer at the upper region of the film. Consequently, the Sr2RuO4 thin films exhibited superconductivity up to 1.15 K, which is the highest among Sr2RuO4 films grown by pulsed laser deposition. This work paves the way for synthesizing pristine RP-phase heterostructures and exploring their unique physical properties.
URI
https://pr.ibs.re.kr/handle/8788114/10002
DOI
10.1021/acs.nanolett.0c04963
ISSN
1530-6984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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