Superconducting Sr2RuO4 Thin Films without Out-of-Phase Boundaries by Higher-Order Ruddlesden–Popper Intergrowth
| Autor: | Carla Palomares Garcia, Lingfei Wang, Bongju Kim, Tae Won Noh, Shingo Yonezawa, Seo Hyoung Chang, R. S. Perry, Miyoung Kim, Hyunsik Im, Jinkwon Kim, Eun Kyo Ko, Jason W. A. Robinson, Yoshiteru Maeno, Yongcheol Jo, Suk Bum Chung, Junsik Mun, Han Gyeol Lee |
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| Rok vydání: | 2021 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Mechanical Engineering Bioengineering Heterojunction 02 engineering and technology General Chemistry Substrate (electronics) engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Pulsed laser deposition chemistry.chemical_compound Ruddlesden-Popper phase chemistry Phase (matter) engineering General Materials Science Thin film 0210 nano-technology Strontium ruthenate |
| Zdroj: | Nano Letters. 21:4185-4192 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.0c04963 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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