دورية أكاديمية
High-sensitivity of initial SrO growth on the residual resistivity in epitaxial thin films of SrRuO$$_3$$ on SrTiO$$_3$$ (001)
| العنوان: | High-sensitivity of initial SrO growth on the residual resistivity in epitaxial thin films of SrRuO$$_3$$ on SrTiO$$_3$$ (001) |
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| المؤلفون: | Kar, Uddipta, Singh, Akhilesh Kr., Yang, Song, Lin, Chun-Yen, Das, Bipul, Hsu, Chia-Hung, Lee, Wei-Li |
| المصدر: | Scientific Reports ; volume 11, issue 1 ; ISSN 2045-2322 |
| بيانات النشر: | Springer Science and Business Media LLC |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Multidisciplinary |
| الوصف: | The growth of SrRuO $$_3$$ 3 (SRO) thin film with high-crystallinity and low residual resistivity (RR) is essential to explore its intrinsic properties. Here, utilizing the adsorption-controlled growth technique, the growth condition of initial SrO layer on TiO $$_2$$ 2 -terminated SrTiO $$_3$$ 3 (STO) (001) substrate was found to be crucial for achieving a low RR in the resulting SRO film grown afterward. The optimized initial SrO layer shows a c (2 $$\times $$ × 2) superstructure that was characterized by electron diffraction, and a series of SRO films with different thicknesses ( t s) were then grown. The resulting SRO films exhibit excellent crystallinity with orthorhombic-phase down to $$t \approx $$ t ≈ 4.3 nm, which was confirmed by high resolution X-ray measurements. From X-ray azimuthal scan across SRO orthorhombic (02 ± 1) reflections, we uncover four structural domains with a dominant domain of orthorhombic SRO [001] along cubic STO [010] direction. The dominant domain population depends on t , STO miscut angle ( $$\alpha $$ α ), and miscut direction ( $$\beta $$ β ), giving a volume fraction of about 92 $$\%$$ % for $$t \approx $$ t ≈ 26.6 nm and $$(\alpha , \beta ) \approx $$ ( α , β ) ≈ (0.14 $$^{\mathrm{o}}$$ o , 5 $$^{\mathrm{o}}$$ o ). On the other hand, metallic and ferromagnetic properties were well preserved down to t $$\approx $$ ≈ 1.2 nm. Residual resistivity ratio (RRR = $$\rho ({\mathrm{300 K}})$$ ρ ( 300 K ) / $$\rho ({\mathrm{5K}})$$ ρ ( 5 K ) ) reduces from 77.1 for t $$\approx $$ ≈ 28.5 nm to 2.5 for t $$\approx $$ ≈ 1.2 nm, while $$\rho ({\mathrm{5K}})$$ ρ ( 5 K ) increases from 2.5 $$\upmu \Omega $$ μ Ω cm for t $$\approx $$ ≈ 28.5 nm to 131.0 $$\upmu \Omega $$ μ Ω cm for t $$\approx $$ ≈ 1.2 nm. The ferromagnetic onset temperature ( $$T'_{\mathrm{c}}$$ T c ′ ) of around 151 K remains nearly unchanged down to t $$\approx $$ ≈ 9.0 nm and decreases to 90 K for t $$\approx $$ ≈ 1.2 nm. Our finding thus provides a practical guideline to achieve high crystallinity and low RR in ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1038/s41598-021-95554-x |
| الإتاحة: | https://doi.org/10.1038/s41598-021-95554-xTest https://www.nature.com/articles/s41598-021-95554-x.pdfTest https://www.nature.com/articles/s41598-021-95554-xTest |
| حقوق: | https://creativecommons.org/licenses/by/4.0Test ; https://creativecommons.org/licenses/by/4.0Test |
| رقم الانضمام: | edsbas.2D003A20 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1038/s41598-021-95554-x |
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