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Co-appearance of superconductivity and ferromagnetism in a Ca2RuO4 nanofilm crystal
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| Title: | Co-appearance of superconductivity and ferromagnetism in a Ca2RuO4 nanofilm crystal |
| Authors: | Nobukane, Hiroyoshi Browse this author →KAKEN DB | | Yanagihara, Kosei Browse this author | | Kunisada, Yuji Browse this author | | Ogasawara, Yunito Browse this author | | Isono, Kakeru Browse this author | | Nomura, Kazushige Browse this author | | Tanahashi, Keita Browse this author | | Nomura, Takahiro Browse this author | | Akiyama, Tomohiro Browse this author | | Tanda, Satoshi Browse this author |
| Issue Date: | 26-Feb-2020 |
| Publisher: | Nature Publishing Group |
| Journal Title: | Scientific reports |
| Volume: | 10 |
| Issue: | 1 |
| Start Page: | 3462 |
| Publisher DOI: | 10.1038/s41598-020-60313-x |
| Abstract: | By tuning the physical and chemical pressures of layered perovskite materials we can realize the quantum states of both superconductors and insulators. By reducing the thickness of a layered crystal to a nanometer level, a nanofilm crystal can provide novel quantum states that have not previously been found in bulk crystals. Here we report the realization of high-temperature superconductivity in Ca2RuO4 nanofilm single crystals. Ca2RuO4 thin film with the highest transition temperature T-c (midpoint) of 64 K exhibits zero resistance in electric transport measurements. The superconducting critical current exhibited a logarithmic dependence on temperature and was enhanced by an external magnetic field. Magnetic measurements revealed a ferromagnetic transition at 180 K and diamagnetic magnetization due to superconductivity. Our results suggest the co-appearance of superconductivity and ferromagnetism in Ca2RuO4 nanofilm crystals. We also found that the induced bias current and the tuned film thickness caused a superconductor-insulator transition. The fabrication of micro-nanocrystals made of layered material enables us to discuss rich superconducting phenomena in ruthenates. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/79508 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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