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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.
Type: article
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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