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Discovery of superconductivity in KTaO3 by electrostatic carrier doping

热1 唐唐添加于 2011-5-25 03:45 | 3660 次阅读 | 1 个评论

作者
Ueno K, Nakamura S, Shimotani H, Yuan HT, Kimura N, Nojima T, Aoki H, Iwasa Y, Kawasaki M
摘要
Superconductivity at interfaces has been investigated since the first demonstration of electric-field-tunable superconductivity in ultrathin films in 19601. So far, research on interface superconductivity has focused on materials that are known to be superconductors in bulk1, 2, 3, 4, 5, 6, 7, 8, 9. Here, we show that electrostatic carrier doping can induce superconductivity in KTaO3, a material in which superconductivity has not been observed before10, 11. Taking advantage of the large capacitance of the self-organized electric double layer that forms at the interface between an ionic liquid and KTaO3 (ref. 12), we achieve a charge carrier density that is an order of magnitude larger than the density that can be achieved with conventional chemical doping. Superconductivity emerges in KTaO3 at 50 mK for two-dimensional carrier densities in the range 2.3 × 1014 to 3.7 × 1014 cm−2. The present result clearly shows that electrostatic carrier doping can lead to new states of matter at nanoscale interfaces.
详细资料
- 文献种类: Journal Article
- 期刊名称: Nature Nanotechnology
- 期刊缩写: Nature Nanotech
- 期卷页: 2011年
- ISBN: 1748-3387
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