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DOI | 10.1038/s41467-019-08842-6 |
Full-gap superconductivity in spin-polarised surface states of topological semimetal beta-PdBi2 | |
Iwaya, K.1; Kohsaka, Y.1; Okawa, K.2,3; Machida, T.1; Bahramy, M. S.1; Hanaguri, T.1; Sasagawa, T.2,3 | |
2019-03-07 | |
发表期刊 | NATURE COMMUNICATIONS
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ISSN | 2041-1723 |
出版年 | 2017 |
卷号 | 8 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | A bulk superconductor possessing a topological surface state at the Fermi level is a promising system to realise long-sought topological superconductivity. Although several candidate materials have been proposed, experimental demonstrations concurrently exploring spin textures and superconductivity at the surface have remained elusive. Here we perform spectroscopic-imaging scanning tunnelling microscopy on the centrosymmetric superconductor beta-PdBi2 that hosts a topological surface state. By combining first-principles electronic-structure calculations and quasiparticle interference experiments, we determine the spin textures at the surface, and show not only the topological surface state but also all other surface bands exhibit spin polarisations parallel to the surface. We find that the superconducting gap fully opens in all the spin-polarised surface states. This behaviour is consistent with a possible spin-triplet order parameter expected for such in-plane spin textures, but the observed superconducting gap amplitude is comparable to that of the bulk, suggesting that the spin-singlet component is predominant in beta-PdBi2. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413117400010 |
WOS关键词 | LOCALIZED WANNIER FUNCTIONS ; THIN-FILMS ; ORDER |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204250 |
专题 | 资源环境科学 |
作者单位 | 1.RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan; 2.Tokyo Inst Technol, Lab Mat & Struct, Yokohama, Kanagawa 2268503, Japan; 3.Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan |
推荐引用方式 GB/T 7714 | Iwaya, K.,Kohsaka, Y.,Okawa, K.,et al. Full-gap superconductivity in spin-polarised surface states of topological semimetal beta-PdBi2[J]. NATURE COMMUNICATIONS,2019,8. |
APA | Iwaya, K..,Kohsaka, Y..,Okawa, K..,Machida, T..,Bahramy, M. S..,...&Sasagawa, T..(2019).Full-gap superconductivity in spin-polarised surface states of topological semimetal beta-PdBi2.NATURE COMMUNICATIONS,8. |
MLA | Iwaya, K.,et al."Full-gap superconductivity in spin-polarised surface states of topological semimetal beta-PdBi2".NATURE COMMUNICATIONS 8(2019). |
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